Dalil

Quran Qaf 50:18

مَّا يَلۡفِظُ مِن قَوۡلٍ إِلَّا لَدَيۡهِ رَقِيبٌ عَتِيدٞ

Translation

He [i.e., man] utters no word except that with him is an observer prepared [to record].