Sayyiduna Hakim bin Hizam (may Allah be pleased with him) narrates: The Messenger of Allah once gave him a dinar and said, "Buy a sacrificial animal with this." So he bought a sacrificial animal for one dinar, then sold it for two dinars, then bought another sacrificial animal for one dinar. He then came to the Prophet with one dinar and a sacrificial animal. The Prophet gave that dinar in charity and prayed for blessings for him.