Donate your possessions for charitable purposes without expecting anything in return .

This hadith speaks to the importance of donating charity with the intention that it will not be taken back. Umar b. Khattab donated a horse in the path of Allah, but its possessor made it languish and he thought that he would sell it at a cheap price. He asked Allah's Messenger about what to do in this situation, and was told not to buy it or take his charity back because doing so is like a dog who swallows its vomit - an act which is disgusting and shameful. This hadith teaches us that when we donate something for charitable purposes, we should do so with no expectation of getting anything in return; if we take our donation back then we are essentially undoing our good deed and behaving disgracefully just like a dog eating its own vomit.