"The Messenger of Allah forbade two kinds of garments, and he forbade two kinds of transactions for us: Munabadhah and Mulamasah, which are kinds of transactions which were common during the Jahiliyyah."
Sunan an-Nasa'i Book 44, Hadith 68
← Previous Hadith "The Messenger of Allah forbade two kinds of garments and two kinds of transactions. As for the two kinds of transactions, they are Mulamash and Munabadhaha. Munabadha is when a man says, 'I throw this garment, and the transaction becomes binding, and Mulamasah is when a man touches it with his had, without spreading it out and checking it, and once he touches it, the transaction becomes binding."

Sunan an-Nasa'i Book 44, Hadith 67 Next Hadith → Munabadhah and Mulamasha. And he said that Mulamasah means when one man says to another: "I will sell you my garment for your garment," and neither of them looks at the garment of the others, rather he just touches it. And Munabadhah is when he says: "I will throw what I have and you throw what you have," so that they buy from one another, and neither of them knows how much the other has, and so on.

Sunan an-Nasa'i Book 44, Hadith 69