Sura 50 The letter Qaaf (Qaf), aya 18

1. مَا يَلْفِظُ مِنْ قَوْلٍ إِلَّا لَدَيْهِ رَقِيبٌ عَتِيدٌ

   Man does not utter any word except that with him is an observer prepared (to record).

   50:18

Tafsiri: Saheeh International