Quran 39:13 from Surah Az-Zumar on Divine Marvels.
قُلۡ إِنِّيٓ أَخَافُ إِنۡ عَصَيۡتُ رَبِّي عَذَابَ يَوۡمٍ عَظِيمٖ
English translation: Say Indeed I [I] fear if I disobey my Lord (the) punishment (of) a Day great
Transliteration: qul inni akhafu in asaytu rabbi adhaba yawmin azimin