Bashr bin Hilal al-Swaf بشر بن هلال الصواف · The Book of the Sunnah

"Whenever Ibn 'Umar heard a Hadith from the Messanger of Allah (ﷺ), he would not do more than it said, and he would not do less."

"The Messenger of Allah (ﷺ) said: 'Knowledge is based on three things, and anything beyond that is superfluous: a clear Verse, an established Sunnah, or the rulings by which the inheritance is divided fairly.'"