Once the Prophet (ﷺ) after drinking something in the house of one of the Companions, said -

اَللَّهُمَّ أَطْعِمْ مَنْ أَطْعَمَنِيْ وَاسْقِ مَنْ سَقَانِيْ (وَأَسْقِ مَنْ أَسْقَانِي)

Allaahumma 'at'im man 'at'amanee wasqi man saqaanee (in another narration: wa asqee man asqaani)

O Allah, feed the one who has fed me and drink to the one who has given me drink.

Reference: Muslim: 2055