What is the prescribed method for summoning people to the Istisqa' prayer?
Chapter on the Prayer for Rain (Istisqa)
Al-Mughni
Book of the Eclipse Prayers (Solar and Lunar)
Primary text
It is prescribed to announce the call for the Istisqa' prayer by saying, 'As-salatu jamia'ah' (Gather for prayer). This is the same call used for the Eid and eclipse prayers.