It is narrated from Sayyiduna Salamah bin Akwa’ (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) saw a man eating with his left hand, so he said: "Eat with your right hand." He replied, "I am not able to eat with my right hand." The Prophet (peace and blessings be upon him) said: "May you not be able to," so after that his right hand could not reach his mouth.