Sayyida Umm Salamah (may Allah be pleased with her) narrates this statement of the Prophet Muhammad (peace be upon him): "I am a human being. You people bring your disputes to me. It is possible that someone may present his case more eloquently than the other, so if I give a decision in someone's favor regarding something that actually belongs to his brother, then I have only cut out a piece of Hell for him."
Hadith Referenceصحیح ابن حبان / كتاب القضاء / 5072
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - انظر ما قبله.فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح على شرط الشيخين