This was narrated by Sa’ad ibn Abdillah from Ahmad ibn Muhammad from Muhammad ibn Sinan from Hammad ibn Uthman and Khalaf ibn Hammad from Ribi from Abdullah ibn al-Jarud and al-Fudayl ibn Yasar from Abu Abdillah عليه السلام, peace be upon him, who said: We asked Imam al-Sadiq عليه السلام about a man who prayed with an imam (of prayer) whom he follows, and he raised his head from sujud before the imam (of prayer) raised his head from sujud. Imam عليه السلام said: “Then let him prostrate (again). And whoever catches the imam (of prayer) after he has raised his head from rukuh, let him prostrate with him, but he should not count that sujud (as part of his own prayer).”