2 Peter 1:18

Overview - 2 Peter 1
Confirming them in hope of the increase of God's graces,
he exhorts them, by faith, and good works, to make their calling sure;
12 whereof he is careful to remind them, knowing that his death is at hand;
16 and warns them to be constant in the faith of Christ, who is the true Son of God, by the eyewitness of the apostles beholding his majesty, and by the testimony of the Father, and the prophets.
Treasury of Scripture Knowledge

2 Peter 1:18  (King James Version)
And this voice which came from heaven we heard, when we were with him in the holy mount.

Matthew 17:6

the holy
Genesis 28:16 Genesis 28:17 ; Exodus 3:1 Exodus 3:5 ; Joshua 5:15 ; Isaiah 11:9 ; 56:7 Zechariah 8:3 ; Matthew 17:6