مُطِرْنَا بِفَضْلِ اللَّهِ وَرَحْمَتِهِ

Mutirnaa bifadhlillaahi wa rahmatihi

It has rained by the bounty of Allah and His mercy. Narrated Zaid bin Khalid Al-Juhani (RA): The Prophet (ﷺ) led us in the Fajr prayer at Hudaibiya after a rainy night. On completion of the prayer, he faced the people and said, "Do you know what your Lord has said (revealed)?" The people replied, "Allah and His Apostle know better." He said, "Allah has said, 'In this morning some of my slaves remained as true believers and some became non-believers; whoever said that (The dua is mentioned above) had belief in Me and he disbelieves in the stars, and whoever said that it rained because of a particular star had no belief in Me but believes in that star.'

Reference: Bukhari: 846