Sunan an-Nasa'i 5421
سنن النسائي#5421SahihIt was narrated that 'Abdullah bin Abi Bakrah, who was a governor in Sijistan, said:"Abu Bakrah wrote to me, saying: 'I heard the Messenger of Allah [SAW] say: No one should pass two judgments on one issue, and no one should pass judgment between two disputing parties while he is angry
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: 49:43