Imam Al-Nawawi’s Riyad-us-Saliheen Chapter 278: Prohibition of Recounting of Favors
Allah, the Exalted, says:
“O you who believe! Do not render in vain your Sadaqah (charity) by reminders of your generosity or by injury.” (2:264)
“Those who spend their wealth in the Cause of Allah, and do not follow up their gifts with reminders of their generosity or with injury.” (2:262)
Abu Dharr رضي الله عنه said: The Prophet صل الله عليه وسلم observed: “There are three (types of) people to whom Allah will neither speak on the Day of Resurrection nor look at them nor purify them, and they will have a painful chastisement.” The Messenger of Allah صلى الله عليه وسلم repeated it three times. Abu Dharr (May Allah be pleased with him) remarked: “They are ruined. Who are they, O Messenger of Allah?” Upon this, the Messenger of Allah صلى الله عليه وسلم said, “One who lets down his lower garments (below his ankels) out of arrogance, one who boasts of his favours done to another; and who sells his goods by taking a false oath.”
[Muslim].