Sayyidah Umm Salamah (may Allah be pleased with her) said that the Messenger of Allah (peace and blessings be upon him) said: "I am only a human being, and you bring your disputes to me. Some of you may be more able than others to present his arguments, and I judge according to what I heard. In such a case, whoever I judge in favour of with someone's right should not take anything of it, for I am cutting off a piece of Hell and giving it to him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 20532