Musnad Abu Ya'la al-Mawsili 155:80

Wahb ibn Baqiyyah al-Wasiti narrated to us, Khalid narrated to us, from Muhammad ibn ‘Amr, from Abu Salamah, from Abu Hurayrah, who said: The Messenger of Allah (ﷺ) said: "I am only a human being, and it may be that some of you are more eloquent in their argument than others. So, whoever I judge in his favor with something of his brother’s wealth, I have only cut out for him a piece of the Fire."