Authentic sources
We learn from the Qur’an and authentic narrations – as the Companions and the scholars after them understood them.
فَإِن تَنَازَعْتُمْ فِي شَيْءٍ فَرُدُّوهُ إِلَى اللَّهِ وَالرَّسُولِ
“If you disagree about anything, refer it to Allah and the Messenger.”
An-Nisa 4:59