(30) باب لاَ يَحِلُّ لأَحَدٍ أَنْ يَرْجِعَ فِي هِبَتِهِ وَصَدَقَتِهِ
Narrated `Umar bin Al-Khattab:
I gave a horse in Allah's Cause. The person to whom it was given, did not look after it. I intended to buy it from him, thinking that he would sell it cheap. When I asked the Prophet (ﷺ) he said, "Don't buy it, even if he gives it to you for one Dirham, as the person who takes back what he has given in charity, is like a dog that swallows back its vomit."
Reference: Sahih al-Bukhari 2623
In-book reference: Book 51, Hadith 55
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 47, Hadith 792