Qur'ān 56:70 · Al-Waqi'ah (الواقعة)

لَوْ نَشَآءُ جَعَلْنَـٰهُ أُجَاجًۭا فَلَوْلَا تَشْكُرُونَ

If We willed, We could make it bitter, so why are you not grateful?