4:86
وَاِذَا حُیّٖیتُمْ بِتَحِیَّةٍ فَحَیُّوا بِاَحْسَنَ مِنْهَٓا اَوْ رُدُّوهَاؕ اِنَّ اللّٰهَ كَانَ عَلٰى كُلِّ شَیْءٍ حَسٖیبًا
Waitha huyyeetum bitahiyyatin fahayyoo biahsana minha aw ruddooha inna Allaha kana AAala kulli shayin haseeban
Translations
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
Saheeh International
When ye are greeted with a greeting, greet ye with a better than it or return it. Lo! Allah taketh count of all things
Marmaduke Pickthall