Abu Dawud
Foods
Book Number: 021 / Hadith Number: 3741
Narated By AbuKarimah : The Prophet (pbuh) 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.