The Obligation Of Implementing The Sunnah And Deeming Whoever Rejects It Of Disbelief

From the book:

Allah (سبحانه وتعالى) says in Surah An-Nūr:

“And let those who oppose the Messenger’s (Muhammad ﷺ) commandment (i.e., his Sunnah – legal ways, orders, acts of worship, statements) (among the sects beware, lest some Fitnah (disbelief, trials, afflictions, earthquakes, killing, overpowered by a tyrant) should befall them or a painful torment be inflicted on them.”
(Surah an-Nūr 24:63)

and Allah says in Surah Al-Hashr:

“And whatsoever the Messenger (Muhammad ﷺ) gives you, take it; and whatsoever he forbids you, abstain (from it).”
(Surah al-Hashr 59:7)

In this regard, many verses indicate the obligation of obeying the Prophet and adhering to his Sunnah. Also, previous evidence indicated the obligation of adhering to the Book of Allah, sticking to it and complying with his orders and abstaining from its prohibitions. These are two relevant fundamentals in which whoever denies one of them denies the other. This is considered an act of disbelief and misguidance which takes one outside the fold of Islam as agreed by all the scholars.

The ahādīth of the Prophet (ﷺ) indicated the obligation of obeying the Messenger of Allah (ﷺ), following his Sunnah and refraining from disobeying him. All of this is relative to the people of his era as well as those to come. It is related by Al-Bukhārī and Muslim on the authority of Abū Hurayrah (رضي الله عنه) that the Prophet (ﷺ) said:

“Whoever obeys me, obeys Allah; and he who disobeys me disobeys Allah.”