Xalifa — musulmonlarning umumiy rahbari bo‘lib, Islom shariat hukmlarini o‘rnatish va islom da’vatini butun dunyoga yetkazish uchun xizmat qiladi. Demak, shariatni o‘rnatish va da’vatni dunyoga yetkazish — xilofat lavozimi aynan shu ikki ish uchun mavjud bo‘lgan ikki masaladir; ikkalasi ham xilofat lavozimining vazifasidir. Xalifadan boshqa birortasining bularni nazorat qilishi to‘g‘ri emas, shuningdek xalifaga o‘rniga ikkalasini nazorat qiladigan shaxsni tayinlashi ham joiz emas, chunki bay’at aynan shu ikki masala uchun beriladi va bay’at shartnomasi uning shaxsi zimmasida tuziladi. Shu sababli u shartnoma tuzilgan ishni boshqasiga topshirishga haqli emas. Chunki shaxs zimmasiga tuzilgan har bir shartnomada — masalan, yollangan xodim, vakil va sherik kabi shartnomalarda ham — shartnoma tuzilgan ishni boshqasiga bajartirish mumkin emas. Xilofat shartnomasi aynan bir shaxs zimmasida tuzilgan ekan, bu shaxsga xilofat shartnomasi uning zimmasida tuzilgan ishda, ya’ni shariat hukmlarini o‘rnatish va da’vatni olib borish uchun musulmonlarning umumiy rahbarligida, o‘rniga boshqasini qo‘yishi joiz emas.

The Khalifah is the general leader of the Muslims in order to establish the Islamic Shar’a rules, and carry the Islamic da’wah to the world. So establishing the Shar’a and carrying the da’wah to the world are the two matters for the sake of which the post of the Khilafah exists; so both of them are the work of the post of the Khilafah. It is not correct for anyone to supervise them other than the Khalifah nor is it allowed for the Khalifah to establish someone who would supervise both of them instead of him because they are the two matters upon which the bay’ah is given and the bay’ah contract takes place upon his person. So he is not allowed to delegate someone else to perform the work upon which the contract took place. This is because each contract which occurred upon the contractor’s person like the employee, agent and partner it is not permitted for him to delegate someone else to perform the work over which the contract took place. When the Khilafah contract occurs upon a specific person, it is not allowed for this person to delegate someone else to stand in his place in what the Khilafah contract occurred upon his person, which is the general leadership of Muslims to establish the Shar’a rules and carry the da’wah.