Quran 26:135 from Surah Ash-Shu'araa on Divine Marvels.
إِنِّيٓ أَخَافُ عَلَيۡكُمۡ عَذَابَ يَوۡمٍ عَظِيمٖ
English translation: Indeed I [I] fear for you (the) punishment (of) a Day Great
Transliteration: inni akhafu alaykum adhaba yawmin azimin