1. Spitting: Islam has made it undesirable to spit in the mosque. Bukhari and Muslim reported on the authority of Anas ibn Malik that the Messenger of Allah (saw) said, “Spitting in the mosque is a sin and its indemnity is to bury it.” Some Schools of Thought have actually made it forbidden.

2. Trading and announcing the lost riding beast: Islam has made makruh to buy and sell in the mosques. Al-Tirmidhi and al-Nisai reported on the authority of Abu Hurayrah that the Messenger of Allah (saw) said, “If you saw a man buying and selling in the mosque, say to him, ‘May Allah never make you trade profitable’, and if you saw a man announcing the lost of his riding beast say to him, ‘May Allah never return it to you’.” Some Schools of Thoughts have actually made this forbidden.

3. Sitting in circles before the Friday prayer: Islam has made it forbidden to sit in circles before the Friday prayer, and some the Schools of Thoughts have in fact made it mubah..

4. The decorating and the boasting about in the mosques: Anas reported that the Messenger of Allah (saw) said, “The hour will not come until people boast in mosque.” This hadith has been reported by Bukhari, Muslim, al-Nisa‘i, Ibn Majah and Abu Dawud. Ibn ‘Abbas narrated that the Messenger of Allah (saw) said, “I was not ordered to decorate the mosques.” This hadith has been reported by Abu Dawud. This actually refers to the decorating and beautification of the mosques and some Schools of Thoughts have actually made it mubah.

5. The joining (crossing) of the fingers together in the mosques: the learned scholars of all Schools of Thought have consented on the undesirability of joining the fingers together in the mosque. Abu Sa‘id al-Khudri reported, “I entered the mosque with the Messenger of Allah (saw) and there was a man sitting in the middle of the mosque with his knees together and joining his fingers together.

The Messenger of Allah (saw) pointed to him but the man did not notice him, so the Messenger of Allah (saw) turned around and said, ‘If any of you were inside the mosque let him not join his fingers together as this is an act of Shaytan and every one of you is in fact in prayer as long as he is inside the mosque until he comes out of it’.” This hadith has been reported by Imam Ahmad. Some Schools of Thought have made this forbidden.

6. To prevent the study of fiqh, tafseer, science, tilawah (recitation of the Qur’an) and the current affairs of the Muslims: The Islamic Shari‘ah has made it categorically forbidden for anyone to prevent the mention of the name of Allah (swt) and the teaching of His (swt) deen and the application of the deen to manage the affairs of the Muslims. Anyone doing the prevention is considered sinful and an enemy of Allah (swt) and His Messenger, and his credibility would be tarnished, he would become a wrongdoer, no testimony would be accepted of him and his company would be undesirable. All Islamic Schools of Thought agree on this for Allah (swt) says, “???” [TMQ : ] The mosque is a public place which does not require a permission for entry: The learned scholars of all the Islamic Schools of Thought have consented that the mosque is the House of Allah (swt) and that He (swt) has given permission to everyone to enter into it in order to mention His (swt) name, worship Him (swt) and study the affairs of the Muslims inside it, just like what the Messenger of Allah (saw), his (saw) Sahabah, his (saw) family and al-Salaf al-Salih (the righteous successors)

used to do. Some Schools of Thought have considered the one who prevents people from entering the mosques as being a disbeliever and an apostate, and the one who imposes the seeking of a permission to enter the mosques under the pretext of organisational and administrative formalities is considered a fasiq (wrongdoer) and a mubtadi‘ (innovative); this is so because the permission to enter the mosque is given by Allah (swt) and it is of general nature. He (swt) says, “ ???” [TMQ : ] This permission applies to every place known as a mosque, for Allah (swt) says, “???” [TMQ : ]