Foods (Kitab Al-At'imah)
Dawud :: Book 27 : Hadith 3741
Narrated AbuKarimah:
The Prophet (peace_be_upon_him) said: It is a duty of every Muslim (to provide hospitality) to a guest for a night. If anyone comes in the morning to his house, it is a debt due to him. If he wishes, he may fulfil it, and if he wishes he may leave it.