Yazid bin al-Had (may Allah have mercy on him) narrates that when water flowed (in a torrent), he (peace and blessings be upon him) would say: "Come out with us to this which Allah has made a means of purification, so that we may purify ourselves with it and praise Allah for it."
This is munqati' (its chain is broken).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الاستسقاء / 6457