Chapter on the Virtue of Mosques and Prayer Within Them, and the Virtue of Congregational Prayer and Its Rulings

Al-Husayn ibn Sa'id from Hammad ibn Isa from Mu'awiyah ibn Wahb, who said: I saw Abu Abdillah عليه السلام, peace be upon him, one day when He عليه السلام entered the ‘Sacred Mosque’ for the Asr prayer. When Imam عليه السلام was short of reaching the rows, the people bowed, so He عليه السلام bowed, then performed the two prostrations, then stood and continued until He عليه السلام joined the rows (of the congregation).