"The Messenger of Allah (ﷺ) forbade two kinds of transactions: Mulimasah and Mundbadhah.
Sunan Ibn Majah Book 12, Hadith 33
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Sunan Ibn Majah Book 12, Hadith 32 Next Hadith → the Messenger of Allah (ﷺ) forbade Mulamasah and Munabadhah. (Sahih) Sahl added: "Sufyan said: 'Mulamasah means when a man touches something with his hand without seeing it, and Munabadhah means when he says: "Toss me what you have, and I will toss you what have."

Sunan Ibn Majah Book 12, Hadith 34