Sahih Muslim Book 010, Hadith Number 3613.
Chapter : Prohibition of Bail Mulamasa and Bai'Munabaza.
Abu Sa'id al-Khudri (Allah be pleased with him) reported: Allah's Messenger (may peace be upon him) 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. This hadith has been narrated on the authority of Ibn Shihab through the same chain of transmitters.