حَدَّثَنَا يَحْيَى بْنُ بُكَيْرٍ، حَدَّثَنَا اللَّيْثُ، عَنْ عُقَيْلٍ، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ ـ رضى الله عنهما ـ كَانَ يُحَدِّثُ أَنَّ عُمَرَ بْنَ الْخَطَّابِ تَصَدَّقَ بِفَرَسٍ فِي سَبِيلِ اللَّهِ فَوَجَدَهُ يُبَاعُ، فَأَرَادَ أَنْ يَشْتَرِيَهُ، ثُمَّ أَتَى النَّبِيَّ صلى الله عليه وسلم فَاسْتَأْمَرَهُ فَقَالَ ‏"‏ لاَ تَعُدْ فِي صَدَقَتِكَ ‏"‏ فَبِذَلِكَ كَانَ ابْنُ عُمَرَ ـ رضى الله عنهما ـ لاَ يَتْرُكُ أَنْ يَبْتَاعَ شَيْئًا تَصَدَّقَ بِهِ إِلاَّ جَعَلَهُ صَدَقَةً‏.‏

Narrated `Umar

Once I gave a horse in Allah's Cause (in charity) but that person did not take care of it. I intended to buy it, as I thought he would sell it at a low price. So, I asked the Prophet (p.b.u.h) about it. He said, "Neither buy, nor take back your alms which you have given, even if the seller were willing to sell it for one Dirham, for he who takes back his alms is like the one who swallows his own vomit."