Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates: The Prophet (peace and blessings of Allah be upon him) forbade two types of sales: Mulamasah and Munabadhah. (The narrator says:) Munabadhah is when a person says: When I throw this cloth towards you, the deal will be finalized. Mulamasah is when a person touches it with his hand, does not open it, does not turn it over, and says: As soon as I touch it, the deal will become binding. (Imam Ibn Hibban, may Allah have mercy on him, says:) Munabadhah is when the buyer throws the cloth towards the seller and the seller throws the cloth towards the buyer so that the deal between them is finalized. On the condition that when, after that, they become aware of the length and width of the cloth, they will have no right to cancel the deal; only this act of throwing (will be the sign of the deal being finalized). Mulamasah is when the buyer touches the cloth and then buys it on the condition that after that he will have no right (to cancel), meaning when he opens it and when he turns it over (he will have no right); only touching will be sufficient.