Surah An-Nisa Verse 86 - English Translation by Mir Aneesuddin
Surah An-Nisaوَإِذَا حُيِّيتُم بِتَحِيَّةٖ فَحَيُّواْ بِأَحۡسَنَ مِنۡهَآ أَوۡ رُدُّوهَآۗ إِنَّ ٱللَّهَ كَانَ عَلَىٰ كُلِّ شَيۡءٍ حَسِيبًا
And when you are greeted with a greeting, then greet (back in a manner) better than that or return it (with equal courtesy), God is certainly One who takes account of everything