Sahih Muslim | Book 38 | Hadith Number 6686
Narrated by Abu Sa'id Khudri
Abu Sa'id Khudri reported that during the lifetime of Allah's Messenger (may peace be upon him) the hypocrites behaved in this way that when Allah's Apostle (may peace be upon him) set out for a battle, they kept themselves behind, and they became happy that they had managed to sit in the house contrary to (the act of) Allah's Messenger (may peace be upon him), and when Allah's Apostle (may peace he upon him) came back, they put forward excuses and took oath and wished that people should laud them for the deeds which they had not done. It was on this occasion that this verse was revealed: "Think not that those who exult in what they have done, and love to be praised for what they have not done-think not them to be safe from the chastisement; and for them is a painful chastisement" (iii. 18).