He replied:

Praise be to Allah, Lord of all worlds. All people must affirm what the Prophet—may Allah bless him and grant him peace—brought. Whatever is contained in the Noble Quran or the known Sunnah must be affirmed in general, and in detail when those details are known. A person is not a believer until he affirms what the Prophet—may Allah bless him and grant him peace—brought. This is the fulfillment of the testimony that there is no deity worthy of worship except Allah and that Muhammad is the Messenger of Allah. Whoever testifies that he is Allah’s Messenger thereby testifies that he is truthful in what he conveys from Allah Most High. This is the very essence of testifying to his messengership, for a liar is not a messenger in what he lies about. Allah Most High has said:

“Had he fabricated any sayings against Us,
We would have seized him by the right hand,
then severed his aorta.”

In short, this is necessarily known to be part of the religion of Islam and needs no demonstration here: one must affirm what the Prophet—may Allah bless him and grant him peace—brought, namely, the Quran and the Sunnah. As Allah Most High has said:

“Allah has certainly bestowed His favor upon the believers by raising among them a Messenger from their own number, reciting His verses to them, purifying them, and teaching them the Book and wisdom, although before that they were clearly astray.”

He Most High also said:

“Just as We sent among you a Messenger from your own number, reciting Our verses to you, purifying you, and teaching you the Book and wisdom.”

He Most High also said:

“Remember Allah’s favor upon you and what He has sent down to you of the Book and wisdom, with which He admonishes you.”

He Most High also said:

“We sent no messenger except to be obeyed by Allah’s permission.”

He Most High also said:

“But no, by your Lord, they will not believe until they make you judge in their disputes and then find no