Al-An'am 6:15
قُلْ إِنِّىٓ أَخَافُ إِنْ عَصَيْتُ رَبِّى عَذَابَ يَوْمٍ عَظِيمٍ
Qul innee akhafu in AAasayturabbee AAathaba yawmin AAatheem
Say, "Indeed I fear, if I should disobey my Lord, the punishment of a tremendous Day."
Say, “If I disobey my Lord, I fear the punishment of a momentous day.”