Az-Zumar - 13

﴿قُلْ إِنِّي أَخَافُ إِنْ عَصَيْتُ رَبِّي عَذَابَ يَوْمٍ عَظِيمٍ﴾

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