Dua 185 ☆
اللَّهُمَّ أَطْعِمْ مَنْ أَطْعَمَنِي، وَاسْقِ مَنْ سَقَانِي
Allaahumma 'at'im man 'at'amanee wasqi man saqaanee.
O Allah , feed the one who has fed me and drink to the one who has given me drink.
Reference: Muslim 3/126.