Sunan Ibn Majah, Book 33, Hadith 21 (In-Book) ⓘ

It was narrated that Miqdam Abu Karimah said: "The Messenger of Allah said: ' Putting up a guest for one night is obligatory. If you find a guest at your door in the morning, then this (hospitality) is (like) a debt that you (the host) owe him. If he (the guest) wants, he may request it, and if he wants, he may leave it'"

حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنِ الشَّعْبِيِّ، عَنِ الْمِقْدَامِ أَبِي كَرِيمَةَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ ‏ "‏ لَيْلَةُ الضَّيْفِ وَاجِبَةٌ فَإِنْ أَصْبَحَ بِفِنَائِهِ فَهُوَ دَيْنٌ عَلَيْهِ فَإِنْ شَاءَ اقْتَضَى وَإِنْ شَاءَ تَرَكَ ‏" ‏ ‏.‏