وَإِذْ تَأَذَّنَ رَبُّكُمْ لَئِن شَكَرْتُمْ لَأَزِيدَنَّكُمْ ۖ وَلَئِن كَفَرْتُمْ إِنَّ عَذَابِى لَشَدِيدٌ
wa-idh ta-adhana rabbukum la-in shakartum la-azīdannakum wala-in kafartum inna ʿadhābī lashadīdun
And [remember] when your Lord proclaimed, 'If you are grateful, I will surely increase you [in favor]; but if you deny, indeed, My punishment is severe.'"
— Saheeh International
Remember that He promised, “If you are thankful, I will give you more, but if you are thankless, My punishment is terrible indeed.” ’
— M. A. S. Abdel Haleem
And (remember) when your Lord proclaimed: "If you give thanks (by accepting Faith and worshipping none but Allâh), I will give you more (of My Blessings); but if you are thankless (i.e. disbelievers), verily My punishment is indeed severe."
— Muhammad Muhsin Khan & Muhammad Taqi-ud-Din al-Hilali