Musnad Ahmad 462:3

Ziyad ibn Abdullah al-Bakkai narrated to us, he said: Mansur narrated to us, from Amir, from Abu Karimah, a man from the companions of the Messenger of Allah, may Allah bless him and grant him peace, who said: The Messenger of Allah, may Allah bless him and grant him peace, said: "The night of the guest is obligatory upon every Muslim. If he wakes up in his courtyard deprived, it is a debt owed to him by him; if he wishes, he may exact it, and if he wishes, he may leave it."