Hadith on Gifts: Taking back charity is like a dog returning to its vomit

Umar ibn Al-Khattab reported: I donated a seasoned horse in the cause of Allah, but its owner made it languish. I thought that he might sell it for a cheap price. I asked the Messenger of Allah, peace be upon him, about it and he said, “Do not buy it and do not take back your charity, for one who takes back his charity is like the dog who returns to his vomit.”

[Sahih Muslim, Book 12, Number 3949]

عُمَرَ بْنَ الْخَطَّابِ قَالَ حَمَلْتُ عَلَى فَرَسٍ عَتِيقٍ فِي سَبِيلِ اللَّهِ فَأَضَاعَهُ صَاحِبُهُ فَظَنَنْتُ أَنَّهُ بَائِعُهُ بِرُخْصٍ فَسَأَلْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ عَنْ ذَلِكَ فَقَالَ لَا تَبْتَعْهُ وَلَا تَعُدْ فِي صَدَقَتِكَ فَإِنَّ الْعَائِدَ فِي صَدَقَتِهِ كَالْكَلْبِ يَعُودُ فِي قَيْئِهِ

صحيح مسلم  كتاب الهبات  باب كراهة شراء الإنسان ما تصدق به ممن تصدق عليه