وَإِذۡ تَأَذَّنَ رَبُّكُمۡ لَئِن شَكَرۡتُمۡ لَأَزِيدَنَّكُمۡۖ وَلَئِن كَفَرۡتُمۡ إِنَّ عَذَابِي لَشَدِيدٞ
And when your Lord caused it to be heard that, "If we render thanks then will I surely increase you more and more: but if ye be thankless. . . . Verily, right terrible my chastisement
Author: John Medows Rodwell