The relationship of the Sunnah to the Qur’aan and its related categories
The Qur’aan and the Sunnah are both Wahi from Allah and we have been commanded to follow what Allah Ta’Aalaa has revealed whether it was revealed as the Qur’aan or as the Sunnah. Allah Ta’Aalaa said:
O you who have believed, obey Allah and obey the Messenger and those in authority among you. And if you disagree over anything, refer it to Allah and the Messenger, if you have believed in Allah and the Last Day (An-Nisaa’ 59).
And Allah Ta’Aalaa said:
And whoever obeys the Messenger has then (indeed) obeyed Allah (An-Nisaa’ 80).
And He Ta’Aalaa said:
But no, by your Lord, they will not [truly] believe until they make you, [O Muhammad], judge concerning that over which they dispute among themselves and then find within themselves no discomfort from what you have judged and submit in [full, willing] submission (An-Nisaa’ 65).