سورة Al-Anam 6:15

قُلْ إِنِّىٓ أَخَافُ إِنْ عَصَيْتُ رَبِّى عَذَابَ يَوْمٍ عَظِيمٍۢ ١٥

Say, “I truly fear—if I were to disobey my Lord—the torment of a tremendous Day.”