Surah Al-An'aam Verse 15

قُلْ إِنِّي أَخَافُ إِنْ عَصَيْتُ رَبِّي عَذَابَ يَوْمٍ عَظِيمٍ



Say, "Indeed I fear, if I should disobey my Lord, the punishment of a tremendous Day."