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আর তোমাদেরকে যদি কেউ দোয়া করে, তাহলে তোমরাও তার জন্য দোয়া কর; তারচেয়ে উত্তম দোয়া অথবা তারই মত ফিরিয়ে বল। নিশ্চয়ই আল্লাহ সর্ব বিষয়ে হিসাব-নিকাশ গ্রহণকারী।
When you are greeted with a greeting, greet in return with what is better than it, or (at least) return it equally. Certainly, Allâh is Ever a Careful Account Taker of all things.

وَإِذَا حُيِّيْتُم بِتَحِيَّةٍ فَحَيُّواْ بِأَحْسَنَ مِنْهَا أَوْ رُدُّوهَا إِنَّ اللّهَ كَانَ عَلَى كُلِّ شَيْءٍ حَسِيبًا
Wa-itha huyyeetum bitahiyyatin fahayyoo bi-ahsana minha aw ruddooha inna Allaha kana AAala kulli shay-in haseeban

YUSUFALI: When a (courteous) greeting is offered you, meet it with a greeting still more courteous, or (at least) of equal courtesy. Allah takes careful account of all things.
PICKTHAL: When ye are greeted with a greeting, greet ye with a better than it or return it. Lo! Allah taketh count of all things.
SHAKIR: And when you are greeted with a greeting, greet with a better (greeting) than it or return it; surely Allah takes account of all things.
KHALIFA: When greeted with a greeting, you shall respond with a better greeting or at least an equal one. GOD reckons all things.