The Sunnah of the Prophet can be divided into three categories: What the Prophet (Sallallahu Alaihi wa Sallam) did?What the Prophet (Sallallahu Alaihi wa Sallam) said?What is the third category?
Praise be to Allah, the Lord of the World; and blessings and peace be upon our Prophet Muhammad and upon all his Family and Companions.
As for the third form of the Sunnah, it is the Prophet's sanctions/ practices tacitly approved by the Prophet.
Allah knows best.
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