"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."
Reference: Sunan an-Nasa'i 4515 In-book : Book 44, Hadith 67 English translation : Vol. 5, Book 44, Hadith 4519
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