Yusuf bin Mahk يوسف بن ماهك الفارسي · Wages (Kitab Al-Ijarah)

On his father's authority, said that his grandfather told that the Messenger of Allah (ﷺ) forbade the type of transactions in which earnest money was paid. Malik said: This means, as we think--Allah better knows-that a man buys a slave or hires an animal, and he says: I give you a dinar on condition that if I give up the transaction or hire, what I gave you is yours.

Hind came to the Prophet (ﷺ) and said: Messenger of Allah, Abu Sufyan is a stingy person. Is there any harm to me if I spend on his dependants from his property without his permission ? The Prophet (ﷺ) replied: There is no harm to you if you spend according to the custom.