Not a Word Does He Utter...

إِذْ يَتَلَقَّى الْمُتَلَقِّيَانِ عَنِ الْيَمِينِ وَعَنِ الشِّمَالِ قَعِيدٌ   

مَّا يَلْفِظُ مِن قَوْلٍ إِلَّا لَدَيْهِ رَقِيبٌ عَتِيدٌ

Behold, two (guardian angels) appointed to learn (his doings) learn (and noted them), one sitting on the right and one on the left.

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

Surah al-Qaaf [50:17-18]