Surah An-Nisa Verse 86 - English Translation by Muhammad Asad
Surah An-Nisaوَإِذَا حُيِّيتُم بِتَحِيَّةٖ فَحَيُّواْ بِأَحۡسَنَ مِنۡهَآ أَوۡ رُدُّوهَآۗ إِنَّ ٱللَّهَ كَانَ عَلَىٰ كُلِّ شَيۡءٍ حَسِيبًا
But when you are greeted with a greeting [of peace], answer with an even better greeting, or [at least] with the like thereof. Verily, God keeps count indeed of all things