Surah As-Saffah (Those Angels Lines up in Ranks), Verse 74

اِلَّا عِبَادَ اللّٰهِ الْمُخْلَصِیْنَ 

Illaa 'ibaadal laahil mukhlaseen

“Except the sincere (and devoted) Servants of Allah.”

Quran 37:74 (Yusuf Ali Translation)