Al-An'am - 6:15

قُلْ إِنِّيَ أَخَافُ إِنْ عَصَيْتُ رَبِّي عَذَابَ يَوْمٍ عَظِيمٍ
[6:15]
Say: Surely I fear, if I disobey my Lord, the chastisement of a grievous day.
Say: "I would, if I disobeyed my Lord, indeed have fear of the penalty of a Mighty Day.
Say: I fear, if I rebel against my Lord, the retribution of an Awful Day.