Muhammad bin Amr bin Ata narrated: I was with Ibn Abbas (may Allah be pleased with them both) and he said: The Prophet (peace and blessings be upon him) went out for the prayer and was met with a gift, a part of a sheep. He (peace and blessings be upon him) ate one or two morsels of it, then prayed and did not perform ablution.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 10750