Musannaf Ibn Abi Shayba 1:1615

Ibn Fudayl narrated to us, from al-A’mash, from some of his companions, from Masruq, from ‘A’ishah, who said: The right hand of the Messenger of Allah, peace and blessings of Allah be upon him, was for his food and his prayer. And his left hand was for what was other than that.