Abu Hurairah (RA) reported: Two types of transactions have been forbidden (by the Holy Prophet), al-Mlulamasa and al-Munabadha. As far as Mulamasa transaction is concerned, it is that every one of them (the parties entering into transaction) should touch the garment of the other without careful consideration, and al-Munabadha is that every one of them should throw his cloth to the other and one of them should not see the cloth of his friend.
Abu Sa'id al-Khudri (RA) reported: Allah's Messenger (ﷺ) forbade us (from), two types of business transactions and two ways of dressing. He forbade Mulamasa and Munabadha in transactions. Mulamasa means the touching of another's garment with his hand, whether at night or by day, without turning it over except this much. Munabadha means that a man throws his garment to another and the other throws his garment, and thus confirming their contract without the inspection of mutual agreement.