Parallel
Hebrews 12:21
Nestle 1904 Greek New Testament · Berean Standard Bible
καί οὕτω φοβερὸν ἦν τὸ φανταζόμενον Μωϋσῆς εἶπεν Ἔκφοβός εἰμι καὶ ἔντρομος
The sight was so terrifying that even Moses said, “I am trembling with fear (note: Deuteronomy 9:19).”