It is narrated from Sayyiduna Miqdam bin Ma'dikarib رضي الله عنه that he heard the Prophet صلى الله عليه وسلم say: "It is obligatory upon every Muslim to take care of the guest for one night. If the guest remains deprived in the courtyard of his host until morning, then the host has become indebted to him; he may repay it if he wishes, or he may forgo it."