Musnad Abu Ya'la al-Mawsili 155:101

Wahb ibn Baqiyyah narrated to us, Khalid ibn Abdullah narrated to us, from Muhammad ibn ‘Amr, from Abu Salamah, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "I am only a human being, and perhaps some of you may be more eloquent in his argument than others. So, whoever I judge in his favor with something of his brother's property, I have only cut for him a piece of the Fire."