It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that once Sayyiduna Umar (may Allah be pleased with him) gave a horse in the way of Allah to someone for riding. He had handed over that horse to the Prophet (peace and blessings be upon him) so that he could give it to someone for riding. Later, he found out that the horse was being sold in the market. He consulted the Prophet (peace and blessings be upon him) about buying it. The Prophet (peace and blessings be upon him) said: Do not buy it, and do not take back your charity.