Surah Al-An'am (The Cattle), Verse 15

قُلْ اِنِّیْۤ اَخَافُ اِنْ عَصَیْتُ رَبِّیْ عَذَابَ یَوْمٍ عَظِیْمٍ ۟

Qul inneee akhaafu in 'asaitu Rabbee 'azaaba Yawmin 'Azeem

“Say: "I would, if I disobeyed my Lord, indeed have fear of the penalty of a Mighty Day.”

Quran 6:15 (Yusuf Ali Translation)