Sunan an-Nasa'i 3332
سنن النسائي#3332SahihIt was narrated from Yazid bin Al-Bara' that his father said:"I met my maternal uncle who was carrying a flag (for an expedition) and I said: 'Where are you going?' He said: 'The Messenger of Allah is sending me to a man who has married his father's wife, and he has commanded me to strike his neck (kill him) and seize his wealth
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiIsnaad Sahih
In-book reference: 26:137