Ali ibn Ibrahim narrated from his father, from Ibn Abi Umair, from Hammad, from al-Halabi, from Abu Abdullah عليه السلام, who said: Imam عليه السلام said: "If a man forgets to wash his right hand and instead washes his left hand, wipes his head and feet, and then remembers afterward, he should wash his right hand and left hand and then wipe his head and feet again. However, if he only forgot his left hand, then let him wash his left hand, and he does not need to repeat what he had already performed in his ablution." Imam عليه السلام further said: "Let your ablution follow itself in sequence."