Surah An-Nisaa, Verse 86
وَإِذَا حُيِّيتُم بِتَحِيَّةٍۢ فَحَيُّوا۟ بِأَحْسَنَ مِنْهَآ أَوْ رُدُّوهَآ ۗ إِنَّ ٱللَّهَ كَانَ عَلَىٰ كُلِّ شَىْءٍ حَسِيبًا
Translation — Sahih International
And when you are greeted with a greeting, greet [in return] with one better than it or [at least] return it [in a like manner]. Indeed, Allah is ever, over all things, an Accountant.
Source
Kur'an-ı Kerim, Nisâ Suresi 4:86
https://kuran.diyanet.gov.tr/mushaf/kuran-meal-2/4-suresi-86-ayet