The lawful, the unlawful, the doubtful matters between them, and the limits Allah has set.
3 hadith
Ibn 'Abbas (May Allah be pleased with them) said: The Messenger of Allah (ﷺ) said, "He who gives something (to someone) as a gift and then gets it back (from him or her) is like a dog which eats its own vomit."Another narration is: "He who gets back his charity is like a dog which vomits and then returns to that and eats it."
'Umar bin Al-Khattab (May Allah be pleased with him) said: I donated a horse in the way of Allah. Its new possessor did not treat it properly. I made my mind to buy it because I thought that he would sell it at a cheap price (now that it became weak and emaciated). I asked the Prophet (ﷺ) about it, whereupon he said, "Do not buy it and do not get back your charity, for one who gets back the charity is like a dog that eats its own vomit."
Abu Hurairah (May Allah be pleased with him) said: The Prophet (ﷺ) said, "He who takes an oath and involuntarily says: 'By Al-Lat and Al-'Uzza' should at once affirm: 'La ilaha illallah (there is no true god except Allah)', and he who says to his companion: 'Come let's gamble' should make expiation by giving something in charity."