Musnad Ahmad 776:3

Yahya ibn Abi Kathir said: Abdullah ibn Abi Talha narrated to me that the Prophet, peace and blessings of Allah be upon him, said: "If one of you eats, let him not eat with his left hand, and if he drinks, let him not drink with his left hand. And if he takes, let him not take with his left hand, and if he gives, let him not give with his left hand."