Hadith.1500 - Whenever the Messenger of Allah صلى الله عليه وعلى آله وسلم prayed for rain (Salat al-Istisqa'), he would say:
Allahumma isqi ‘ibadaka wa baha’imaka wa unshur rahmataka wa ahyi biladaka al-maytah
"O’ Allah سبحانه وتعالى, provide water to Your servants and Your animals, spread Your mercy, and revive Your dead land."
He would repeat this three times.