Sahih al-Bukhari 2081

Umar ibn Hafs narrated to us: My father narrated to us: al-Amash narrated to us, saying: Shaqiq told me, from Abu Masud, who said: A man from the Ansar, known by the kunya Abu Shuaib, came and said to a young butcher in his service, “Prepare food enough for five, for I want to invite the Prophet, peace and blessings be upon him, as the fifth of five. I have noticed hunger in his face.” He invited them, and a man came along with them. The Prophet said, “This man has followed us. If you wish to admit him, then admit him; and if you wish him to return, he will return.” The man said, “No, I have given him permission.”