Abdullah bin Sa'id al-Ashaj عبد الله بن سعيد بن حصين الكندي - الأشج · The Chapters on Business Transactions

the Messenger of Allah (ﷺ) forbade Mulamasah and Munabadhah. (Sahih) Sahl added: "Sufyan said: 'Mulamasah means when a man touches something with his hand without seeing it, and Munabadhah means when he says: "Toss me what you have, and I will toss you what have."