Surah Qaf — Ayah 18 (50:18)
مَّا يَلۡفِظُ مِن قَوۡلٍ إِلَّا لَدَيۡهِ رَقِيبٌ عَتِيدٞ ١٨
English translation (Saheeh International)
He [i.e., man] utters no word except that with him is an observer prepared [to record].
Brief commentary
Man does not utter any word except that with him is an observer prepared [to record]. He does not utter any statement except that there is an angel anticipating whatever he says, present.