"The Messenger of Allah (ﷺ) forbade Gharar transaction sand Hasah transactions. "
Sunan Ibn Majah Book 12, Hadith 58
← Previous Hadith the Prophet (ﷺ) forbade the deal involving earnest money. (Hasan)Abu 'Abdullah said: Earnest money refers to when a man buys an animal for one hundred Dinar, then he gives the seller two Dinar in advance and says: "If I do not buy the animal, then the two Dinar are yours." And it was said that it refers, and Allah knows best, to when a man buys something, and gives the seller a Dirham or less or more, and says: "If I take it (all well and good), and if I do not, then the Dirham is yours."

Sunan Ibn Majah Book 12, Hadith 57 Next Hadith → "The Messenger of Allah (ﷺ) forbade Gharar transactions. "

Sunan Ibn Majah Book 12, Hadith 59