50. Kaf · Verse 18

سورة ق
18

مَّا يَلۡفِظُ مِن قَوۡلٍ إِلَّا لَدَيۡهِ رَقِيبٌ عَتِيدٞ

Not a word does he utter but there is a sentinel by him, ready (to note it).