Quran 14:7 from Surah Ibrahim on Divine Marvels.
وَإِذۡ تَأَذَّنَ رَبُّكُمۡ لَئِن شَكَرۡتُمۡ لَأَزِيدَنَّكُمۡۖ وَلَئِن كَفَرۡتُمۡ إِنَّ عَذَابِي لَشَدِيدٞ
English translation: And when proclaimed your Lord If you are thankful surely I will increase you but if you are ungrateful indeed My punishment (is) surely severe
Transliteration: wa-idh ta-adhana rabbukum la-in shakartum la-azidannakum wala-in kafartum inna adhabi lashadidun