Narrated Ka'b ibn Malik: AbdurRahman ibn Ka'b ibn Malik said: When Ka'b ibn Malik heard the call to prayer on Friday, he prayed for As'ad ibn Zurarah. I asked him: What is the matter that when you hear the call to prayer, you pray for As'ad ibn Zurarah? He replied: This is because he held the Friday prayer for the first time for us at Hazm an-Nabit of Harrah belonging to Banu Bayadah in Naqi', called Naqi' al-Khadumat. I asked him: How many were you at that time ? He said: Forty.