Musnad Ahmad 308:2

Waki’ narrated to us, ‘Abd al-Hamid ibn Ja’far narrated to us, from Sa’id ibn Abi Sa’id al-Maqburi, from Abu Shurayh al-Khuza’i, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Hospitality is three days, and its prize is a day and a night. It is not lawful for a man to stay with someone until he causes him to sin." They said: "O Messenger of Allah, how does he cause him to sin?" He said: "He stays with him when he has nothing to entertain him with."