Quran 83:33 from Surah Al-Mutaffifin on Divine Marvels.
وَمَآ أُرۡسِلُواْ عَلَيۡهِمۡ حَٰفِظِينَ
English translation: But not they had been sent over them (as) guardians
Transliteration: wama ur'silu alayhim hafizina