From him, from Ahmad ibn al-Hasan, from Amr ibn Sa’id, from Musaddiq ibn Sadaqah, from Ammar al-Sabati, from Abu Abdillah عليه السلام, peace be upon him: Imam al-Sadiq عليه السلام said regarding a man upon whom a prayer was obligatory, from a sitting position, but he forgot until he stood and began the prayer while standing, then remembered. Imam عليه السلام said: “He should sit down and begin the prayer, and he should not count his beginning of the prayer while he was standing.”