Az-Zumar - 39:13

قُلْ إِنِّي أَخَافُ إِنْ عَصَيْتُ رَبِّي عَذَابَ يَوْمٍ عَظِيمٍ
[39:13]
Say: 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: Lo! if I should disobey my Lord, I fear the doom of a tremendous Day.