It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that once Sayyiduna Umar Farooq (may Allah be pleased with him) gave a horse to someone in the way of Allah for riding. Later, he saw that the horse was being sold in the market. He thought to himself that he should buy it, so he consulted the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said: Do not take back what you have given in charity.