Musannaf Ibn Abi Shaybah

Hazrat Sha'bi narrates that Hazrat Umar bargained with a man for a horse. To test the horse, he mounted it, and the horse died. He said to the man, "Take your horse back." The man replied, "It is no longer mine." Hazrat Umar said, "Appoint an arbitrator between you and me." The man said, "Let us go to Hazrat Shurayh." Hazrat Shurayh said, "O Leader of the Believers! Take what you have bought, or return it in the condition in which you took it." Hazrat Umar asked, "Will this be the decision?" Then he appointed him as the judge of Kufa. This was the first day he became known.