Preventing One Who Will Mishandle His Wealth

English translation

It was narrated from Anas bin Malik that :

there was a man at the time of the Messenger of Allah (ﷺ) whose mental faculties were lacking, and he used to buy and sell. His family came to the Prophet (ﷺ) and said, “O Messenger of Allah, stop him.” So The Prophet (ﷺ) called him, and told him not to do that. He said: “O Messenger of Allah (ﷺ), I cannot bear to be away from business.” He said, “If you engage in a transaction then say: “Take it (i.e., the goods) and don't cheat (me).' ”

English translation

It was narrated that Muhammad bin Yahya bin Habban said:

“My grandfather was Munqidh bin 'Amr. He was a man who had suffered a head wound and lost the power of speech, but that did not stop him from engaging in trade. He was always being cheated, so he went to the Prophet (ﷺ) and told him about that. He said to him: 'When you buy something, say: “There should be no intention of cheating,” and for every product you buy, you have the choice for three nights. If you are pleased with it, keep it, and if you are displeased then return it.'”