Musnad Ahmad 30:766

Rawh narrated to us, 'Ikrimah ibn 'Ammar narrated to us, I heard Abu al-Ghdiyah al-Yamami say: I came to Medina, and the messenger of Kathir ibn al-Salt came and invited them. No one stood up except Abu Hurayrah and five others with him, and I was one of them. They went and ate. Then Abu Hurayrah came and washed his hand, then said: "By Allah, O people of the mosque, you are indeed disobedient to Abu al-Qasim, may Allah bless him and grant him peace."