We heard this voice (2 Pet 1:18)

“We ourselves

Heard

This voice

From heaven,

While we were with him

On the holy mountain.”

καὶ ταύτην τὴν φωνὴν ἡμεῖς ἠκούσαμεν ἐξ οὐρανοῦ ἐνεχθεῖσαν σὺν αὐτῷ ὄντες ἐν τῷ ἁγίῳ ὄρει.

This author said, “We ourselves heard (ἡμεῖς ἠκούσαμεν) this voice (καὶ ταύτην τὴν φωνὴν) from heaven (ἐξ οὐρανοῦ), while we were with him (ἐνεχθεῖσαν σὺν αὐτῷ) on the holy mountain (ἐν τῷ ἁγίῳ ὄρει).”  This author clearly indicates that he was one of the three people with Jesus at the transfiguration as found in the synoptics, Matthew, chapter 17:1-8, Mark, chapter 9:2-8, and Luke, chapter 9:28-36.  The three people with Jesus were Peter, James, and John, who experienced the transfiguration of Jesus with Moses and Elijah.  This author, presumably Peter, said that he had heard this voice from heaven when he was with Jesus on the holy mountain.  There was no ambiguity here.  The holy mountain may be an illusion to Mount Sinai.  Something wonderful had happened at the transfiguration of Jesus on this holy mountain with the three apostles.  This author was one of them.  Do you believe that Peter is the author of this letter?