Is it recommended to perform ablution (Wudu) using rainwater when a stream flows from it?
Chapter on the Prayer for Rain (Istisqa)
Al-Mughni
Book of the Eclipse Prayers (Solar and Lunar)
Primary text
It is recommended to perform ablution using rainwater when a stream flows from it. The evidence for this is the narration that when a torrent flowed, the Prophet, peace be upon him, would say, 'Let us go out to that which Allah has made a purifier, so that we may purify ourselves with it.'