Explanation

Haywaan (River of Life) is on the 4th heaven. Each day, The leader of the angels Jibra’eel (Alayhi salaam) dips in it and shakes his wings letting off seventy thousand drops. From each of these droplets, Almighty Allah creates one angel (Seventy thousand drops means 70,000 angels). These Angels are commanded to perform salaah in the Bait-ul-Ma’mur.