If someone gives his horse for Allah‘s Cause and then he sees it being sold
باب إِذَا حَمَلَ عَلَى فَرَسٍ فَرَآهَا تُبَاعُ
Sahih al-Bukhari, Book of Fighting for the Cause of Allah (Jihaad)(view book)
Narrated 'Abdullah bin 'Umar:
Umar bin Al-Khattab gave a horse to be ridden in Allah's Cause and then he found it being sold. He intended to purchase it. So, he consulted Allah's Apostle who said, "Don't buy it and don't take back your gift of charity."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما أَنَّ عُمَرَ بْنَ الْخَطَّابِ، حَمَلَ عَلَى فَرَسٍ فِي سَبِيلِ اللَّهِ فَوَجَدَهُ يُبَاعُ، فَأَرَادَ أَنْ يَبْتَاعَهُ، فَسَأَلَ رَسُولَ اللَّهِ ﷺ فَقَالَ " لاَ تَبْتَعْهُ، وَلاَ تَعُدْ فِي صَدَقَتِكَ ".
Classification
Narrated Aslam:
I heard 'Umar bin Al-Khattab saying, "I gave a horse to be ridden in Allah's Cause and the person who got it intended to sell it or neglected it. So, I wanted to buy it as I thought he would sell it cheap. I consulted the Prophet who said, "Do not buy it even if for one Dirham, because he who takes back his gift is like a dog swallowing its vomit."
حَدَّثَنَا إِسْمَاعِيلُ، حَدَّثَنِي مَالِكٌ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ أَبِيهِ، قَالَ سَمِعْتُ عُمَرَ بْنَ الْخَطَّابِ ـ رضى الله عنه ـ يَقُولُ حَمَلْتُ عَلَى فَرَسٍ فِي سَبِيلِ اللَّهِ فَابْتَاعَهُ ـ أَوْ فَأَضَاعَهُ ـ الَّذِي كَانَ عِنْدَهُ، فَأَرَدْتُ أَنْ أَشْتَرِيَهُ، وَظَنَنْتُ أَنَّهُ بَائِعُهُ بِرُخْصٍ، فَسَأَلْتُ النَّبِيَّ ﷺ فَقَالَ " لاَ تَشْتَرِهِ وَإِنْ بِدِرْهَمٍ، فَإِنَّ الْعَائِدَ فِي هِبَتِهِ كَالْكَلْبِ يَعُودُ فِي قَيْئِهِ ".