It is narrated from Hazrat Abu Musa (may Allah be pleased with him) that a man came to him while he was eating chicken. That man sat to one side and said, "I have taken an oath that I will not eat it because I see chickens eating filth." He (Abu Musa) said, "Come closer, for I have seen the Noble Prophet (peace and blessings be upon him) eating it."
Hadith Referenceمسند احمد / تتمہ مُسْنَدِ الْكُوفِيِّينَ / 19554