anything, refer it to Allah and the Messenger, if you truly believe in Allah and the Last Day. That is better and more fitting in outcome.” [al-Nisa 4:59]
Referring a matter to Allah means referring it to His Book, and referring it to the Messenger means referring it to his sunnah and guidance, during his lifetime and after his death.
Allah Most High also says:
“By your Lord, they will not truly believe until they make you judge in all their disputes, then find no reluctance within themselves toward what you have decided, and submit with full submission.” [al-Nisa 4:65]
Thus, Allah Most High swears by His lordship over His Messenger—an especially particular lordship—an emphatic oath that there can be no faith unless we appoint the Prophet, peace and blessings be upon him, as judge in every dispute among us; unless we feel no unease or constraint in our hearts regarding what the Messenger of Allah, peace and blessings be upon him, has decreed; and unless we submit to that with complete submission, through full compliance and implementation. Reflect on how He reinforced submission by using the verbal noun: it indicates that complete submission is indispensable, without deviation or hesitation.
Also reflect on the correspondence between that by which the oath is sworn and that which is affirmed by it. The oath is sworn by Allah’s lordship over His Prophet, peace and blessings be upon him, while what is affirmed is that faith is absent unless the Prophet, peace and blessings be upon him, is made judge in a complete sense—a judgment that entails openness of heart, compliance, and acceptance. For Allah’s lordship over His Messenger entails that his judgments conform to what his Lord has permitted and approved. The implication of the special lordship connected to messengership is that Allah would not leave him upon an error that He does not approve for him.
If the truth does not become clear to him from the Quran and Sunnah, then he must follow the view which he believes most likely to be closest to the truth, in light of the knowledge and religious commitment possessed by its holder. For the Prophet, peace and blessings be upon him, said: “You must adhere to my sunnah and the sunnah of the rightly guided caliphs who come after me. Hold fast to it and bite upon it with your molar teeth.” (1) The people most deserving of this description are the four caliphs: Abu Bakr and Umar,