Ahmad ibn Muhammad from al-Hasan ibn Ali ibn Yaqtin from his brother al-Husayn from Ali ibn Yaqtin who said: I asked Abu al-Hasan عليه السلام, peace be upon him, about a man who bows with the imam (of prayer), following him, then raises his head before the imam (of prayer). Imam عليه السلام said: “He must repeat his bowing with him.”