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اللَّهُمَّ أَطْعِمْ مَنْ أَطْعَمَنِي، وَاسْقِ مَنْ سَقَانِي
Allahumma at'im man at'amani, wasqi man saqani
O Allah, feed the one who fed me, and give drink to the one who gave me drink.
Source Musnad Aḥmad 23809 · Ṣaḥīḥ Muslim, The Book of Drinks — site no. 5225 (similar wording) Ṣaḥīḥ
Compiler cites Muslim 3/1626