Hisn al-Muslim
Allāhumma aghithnā, Allāhumma aghithnā, Allāhumma aghithnā. O Allah, send us rain. O Allah, send us rain. O Allah, send us rain. Reference: Al-Bukhari 1/224, Muslim 2/613.
اللّهُمَّ أغِثْنـا، اللّهُمَّ أغِثْنـا، اللّهُمَّ أغِثْنـا
Reference