The Messenger of Allah صلى الله عليه وآله وسلم said: “Whoever Allah tests by letting him become a judge, should not let one party of a dispute sit near him without bringing the other party to sit near him. And he should fear Allah by his sitting, his looking to both of them and his judging to them. He should be careful not to look down to one as if the other was higher, he should be careful not to shout to one and not the other, and he should be careful of both of them.”

Baihaqi, Darqutni, Tabarani