An-Nisâ’ 4:86
وَإِذَا حُيِّيتُم بِتَحِيَّةٍ فَحَيُّوا بِأَحْسَنَ مِنْهَا أَوْ رُدُّوهَا ۗ إِنَّ اللَّهَ كَانَ عَلَىٰ كُلِّ شَيْءٍ حَسِيبًا ٨٦
Waitha huyyeetum bitahiyyatin fahayyoo biahsana minha aw ruddooha inna Allaha kana AAala kulli shayin haseeban
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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 account of everything. (4:86)