وَاِذَا حُيِّيۡتُمۡ بِتَحِيَّةٍ فَحَيُّوۡا بِاَحۡسَنَ مِنۡهَاۤ اَوۡ رُدُّوۡهَاؕ اِنَّ اللّٰهَ كَانَ عَلٰى كُلِّ شَىۡءٍ حَسِيۡبًا
And when you are honoured with (a word of) greeting, then (in reply) greet with a better (salutation) or (at least) reciprocate (in the same words)Surely Allah takes an account of everything.