Sahih Muslim Book 23, Hadith Number 5056.

Chapter : Permissibility of a person’s taking anyone along with him where the host is very intimate with the guest.

Abu Huraira reported: One day while Abu Bakr was sitting and there was with him Umar also there came to them Allah’s Messenger (may peace be upon him) and he said: What makes you stay here? They said: It is hunger that has brought us out from our houses. By Him Who has stint you with Truth; the rest of the hadith is the same.