The Holy Quran 4:86 — Surah An-Nisa

Arabic text

وَإِذَا حُيِّيتُم بِتَحِيَّةٍ فَحَيُّوا۟ بِأَحْسَنَ مِنْهَآ أَوْ رُدُّوهَآ ۗ إِنَّ ٱللَّهَ كَانَ عَلَىٰ كُلِّ شَىْءٍ حَسِيبًا

Translation

When you are greeted with a greeting, then reply with a better greeting, or (at least) return (the same greeting). Most surely Allaah takes account of everything (and will reward people for every good they do).

Tafsir (excerpt) — Tafsir Usmani

The etiquette of greeting: that is, to greet a Muslim or to pray for him is in reality to intercede for him with Allah. So Almighty Allah explicitly sets out one particular form of good intercession which is widespread among the Muslims: O Muslims, when someone prays for you or greets you, you too must certainly answer him, either by saying the same words…

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