172
اللَّهُمَّ صَيِّبًا نَافِعًا
Allahumma sayyiban nafi'a
O Allah, (let it be) a beneficial downpour.
Source Musnad Aḥmad 24144 · Ṣaḥīḥ al-Bukhārī 1032 (similar wording) Ṣaḥīḥ · Sunan an-Nasāʾī 1523 (similar wording) Ṣaḥīḥ
Compiler cites al-Bukhārī with Fatḥ al-Bārī 2/518