The Khilafah is a contract of consent and choice, because it is a pledge to obey the one with the right of obedience among those in authority. So the consent of the person who is given the bay’ah to hold the Khilafah and the consent of those who give the bay’ah are essential. Therefore, if somebody rejected to be a Khalifah and declined it, he must not be compelled to accept it, but another person is selected instead. Also, it is not allowed to take the bay’ah from the people by force because, in this case, the pledge contract cannot be considered legal due to its contradiction with using force, since the Khilafah is a contract of consent and choice devoid of any compulsion like any other contract. However, if the pledge contract is accomplished by those whose bay’ah is considered (binding) then the bay’ah would be contracted, and the elected person would become the person in authority who must be obeyed. At this point the bay’ah given to him becomes a bay’ah of obedience rather than a bay’ah of the Khilafah contract. In this case he is allowed to force the rest of the people to give him the bay’ah because it is a bay’ah of obedience which is obliged by the Shar’a. It is not correct to say that it is illegal to use compulsion, because the bay’ah in this case is not the contracting bay’ah for the Khilafah. Accordingly, the bay’ah initially is a contract which is not legal except by consent and choice. But after the contract bay’ah is given to the Khalifah the bay’ah becomes obedience to his order, and compulsion comes from the fact that it is allowed to implement the order of Allah (swt). Since the Khilafah is a contract, then there must be a contractor for the contract to be considered legal, like in the judiciary where the person cannot be a judge unless he is appointed in this office by somebody else, and in the imarah nobody can be an Amir (leader) unless there is a person who appoints him in this office. Similarly in the Khilafah, no person can be a Khalifah unless he is appointed in this post as a Khilafah.

Thereupon, it is clear that nobody becomes a Khalifah unless the Muslims appoint him in this post, and he cannot have the authority of the Khilafah unless he is contracted to it. And this contract can only be implemented by two parties - the first is the one who asks for the Khilafah and the second is the Muslims who accepted him as their Khalifah. Therefore, the bay’ah of Muslims is essential to fulfill the Khilafah contract. Accordingly, if someone usurped power by force he will not become a Khalifah even if he declared himself a Khalifah for Muslims, because the contract of Khilafah has not been convened to him by the Muslims. And if he took the bay’ah from the Muslims by force, he is not considered a Khalifah by such bay’ah, because the bay’ah by force is illegal. And the Khilafah cannot be convened by it, since it is a contract of consent and choice (Rada wa ikhtiyar) which cannot be accomplished by force, but is convened by a bay’ah of consent and choice. However, if this usurper (mutasallit) managed to convince the people that it is in their interest to give him the bay’ah, and that the implementation of the Shari’ah laws requires from the people to give him the bay’ah and were convinced of that and accepted it, and they gave him the bay’ah by consent and choice, then he becomes a Khalifah the moment he was given the bay’ah by consent and choice, although he initially held the power by force. So it is a condition that the bay’ah must occur by consent and choice whether the person who obtained the bay’ah was the ruler or not.

As for the people by whose bay’ah the Khilafah is established this can be derived by examining what happened in the bay’ah of the Khulafaa ar-Rashidun and what the Sahabah (ra) agreed upon. In the bay’ah of Abu Bakr (ra) it was sufficient from the ahl al-hal wal ‘aqd (the people of influence) among Muslims in Madinah alone; the opinion of Muslims in Mecca and the rest of the Arabian Peninsula were not sought, they were not even asked. It was the same case in the bay’ah of ‘Umar (ra). As for the bay’ah of ‘Uthman (ra), ‘Abdurrahman bin ‘Auf (ra) took the opinion of the Muslims in Madinah and did not confine it to the people of influence as Abu Bakr (ra) did when he nominated ‘Umar (ra). At the time of ‘Ali (ra) it was sufficed with the bay’ah of the majority of the people of Madinah and Kufa, and he was singled by the bay’ah. His bay’ah was considered legal even by those who disagreed with him and fought against him, as they did not make bay’ah with anyone other than him, and neither did they object to his bay’ah. Rather they demanded revenge for the blood of ‘Uthman (ra), so their case was considered as rebels who avenged a matter from the Khalifah and he had to explain it to them and fight them, but they did not form another Khilafah.

All this happened i.e. giving the bay’ah to the Khalifah from the people of the capital only without the rest of the regions, in the presence of the Sahabah (ra), and none of them disagreed or denied that action of limiting the bay’ah to the majority of the people of Madinah, though they disagreed on the person selected as the Khalifah and denied some of his actions, yet they did not deny that the bay’ah was made to him only by the majority of the people of Madinah. So this was Ijma’a of the Sahabah that the Khilafah is established by those who represent the opinions of the Muslims in the matter of ruling. This is so because the people of influence and the majority of the residents of Madinah represented the opinion of the majority of the Ummah in the matter of ruling in all the territories of the Islamic State at that time.

Accordingly, the Khilafah is convened if the bay’ah is made by the majority of those who represent the Islamic Ummah, who are under the authority of the Khalifah who is being replaced by another, as was the case at the time of the Khulafaa ar-Rashidun. Their bay’ah would then be a bay’ah of contract to the Khilafah. As for the bay’ah of the other people, it becomes a bay’ah of obedience after the Khilafah is convened to the Khalifah which is a bay’ah of submission to the Khalifah, not a bay’ah of contract to establish the Khilafah.

This would be the case if there was a Khalifah who died or was deposed and it is required to establish a Khalifah in his place. But if there is no Khalifah at all, then it becomes obligatory upon Muslims to appoint for themselves a Khalifah to implement the Shari’ah laws and convey the Islamic call to the world, as is the case since the removal of the Islamic Khilafah in Istanbul in 1343 after Hijrah (1924 Christian Era) until the present day, then every country in the Islamic world is eligible to elect a Khalifah and thereby establish a Khilafah. So if one country of the Islamic world appointed a Khalifah, and the Khilafah was established for him, it becomes obligatory upon Muslims to make a pledge of obedience to him i.e. a bay’ah of submission, after the Khilafah was convened to him by the bay’ah of the people in his country, whether this country was big like Egypt, Turkey and Indonesia or small like Albania, Cameroon and Lebanon, on condition that the country fulfils four criteria:

1. The authority in that country must be self-determined depending on Muslims only, not on any disbeliever state or disbeliever influence.

2. The security of Muslims in that country must be through the security of Islam and not the security of Kufr i.e. the protection of the country internally and externally must be Islamic from the power of Muslims in its capacity as a purely Islamic power.

3. The country must commence immediate implementation of Islam comprehensively and radically and also engage in delivering the Islamic call.

4. The elected Khalifah should fulfill the conditions of the Khilafah contract even if he is lacking the preferable conditions, because what matters are the contract conditions.

Therefore, if that country has fulfilled these four conditions, then the Khilafah has been established by the bay’ah of that country alone and it was convened with it alone as well, even if this country does not represent the majority of the influential people who represent the Islamic Ummah. This is so because establishing the Khilafah is a collective duty, and whoever performs this duty in the correct manner would accomplish the prescribed duty. And because the condition concerning the majority of the influential people applies if there was a Khilafah and there was a need to appoint another Khalifah in place of the dead or deposed one. However if there was no Khilafah at all and the establishment of one is necessary, then by its establishment in accordance with Shari’ah the Khilafah will be convened legally by any Khalifah who satisfies the conditions of the contract regardless of the number of the people who elected him, as the matter would be then a question of fulfilling a duty neglected by the Muslims for more than three days. Their negligence to this duty is a termination of their right to choose whom they want for a Khalifah.

So if there arise some people who perform this duty, it suffices for the Khilafah to be established by them, and once the Khilafah is established in that country and contracted to a Khalifah it becomes a duty upon all the Muslims to rally under its banner and to give bay’ah to the Khalifah, otherwise they will be sinful before Allah (swt). The elected Khalifah must invite them to give him bay’ah and if they refused they will be considered as rebels whom the Khalifah must fight until they submit to his authority. If another Khalifah in the same or a different country is elected after the first Khalifah who had the Khilafah convened to him legally by satisfying the four aforementioned conditions, then the Muslims must fight the second Khalifah until he makes bay’ah to the first one. The evidence on this matter is what ‘Abdullah bin ‘Amr bin al-‘Aas narrated, that he heard the Prophet (saw) saying:

And also because the Khalifah of the Muslims is the one who unites the Muslims under the banner of Islam. So if the Khalifah is appointed, the Muslim community (jama’h) would be formed and it becomes obligatory upon Muslims to join this community and haram upon them to dissociate themselves from it. Ibn ‘Abbas (ra) reported that the Prophet (saw) said:

Muslim reported from ibn ‘Abbas from the Prophet (saw) who said:

The indication from these two ahadith is to adhere to the Muslim community and to the authority of Islam.

Non-Muslims have no right in the bay’ah, and it is not obligatory upon them because it is a bay’ah on Islam and on the Book of Allah (swt) and the Sunnah of the Messenger of Allah (saw) and it requires belief in Islam, the Qura'n and the Sunnah. Non-Muslims are not allowed to be involved in ruling or electing the ruler because they have no authority over Muslims and have no place in the bay’ah.