Quran 70:28 from Surah Al-Ma'aarij on Divine Marvels.
إِنَّ عَذَابَ رَبِّهِمۡ غَيۡرُ مَأۡمُونٖ
English translation: Indeed (the) punishment (of) your Lord (is) not to be felt secure (of)
Transliteration: inna adhaba rabbihim ghayru mamunin