Musnad Ahmad 180:4

Hajjaj narrated to us, Shareek narrated to us, from Abdullah ibn Isa, from Jami ibn Umayr—and he did not doubt—from his maternal uncle, Abu Burdah ibn Niyar, who said: I went out with the Prophet, peace and blessings of Allah be upon him, to Baqi al-Musalla. He put his hand into some food, then withdrew it, and it was adulterated—or different [in quality]. He said: "He is not one of us who cheats us."