Sahih Muslim 2777
Characteristics of The Hypocrites And Rulings Concerning Them
Abu Sa'id Khudri reported that during the lifetime of Allah's Messenger (ﷺ) the hypocrites behaved in this way that when Allah's Messenger (ﷺ) 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 (ﷺ), and when Allah's Messenger (ﷺ) 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).