once
مُطِرْنَا بِفَضْلِ اللَّهِ وَرَحْمَتِهِ
Edition transliteration
Mutirna bifadlil-lahi warahmatih.
Meaning
We have been given rain by the grace and mercy of Allah.
Source and references
Hisn al-Muslim, entry 173.The reference is copied from the edition; separate editorial verification is not complete yet.
Source edition: Fortress of the Muslim. Open source ↗