Bukhari

And he was told to reform himself and to take care of himself, but despite that he wasted his wealth, so the ruler will prevent him from spending. Because the Prophet (ﷺ) forbade the wasting of wealth. And the Prophet (ﷺ) said to the person who used to be deceived in buying and selling, "When you buy or sell, say: 'There is to be no deception.'" The Messenger of Allah (ﷺ) did not take his wealth into his own possession.

Narrated Ibn `Umar: A man was often cheated in buying. The Prophet said to him, "When you buy something, say (to the seller), No cheating." The man used to say so thenceforward .

And it is narrated from Jabir (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) rejected a man's charity, then forbade him from giving charity in such a state. And Imam Malik (may Allah have mercy on him) said that if someone owes a debt to another and the debtor has only one slave, and apart from this he has no other property, then if the debtor frees that slave, his emancipation will not be valid.