Answer: The voice from heaven said, "This is My Son, Whom I love; with Him I am well pleased," (verse 17).
MORE INFORMATION AND/OR OTHER SCRIPTURE REFERENCES:
See also: Isaiah 42:1; Matthew 12:18; Matthew 17:5; Mark 1:11; Mark 9:7; Luke 3:22; Luke 9:25.
2 Peter 1:17-18: "For He received honor and glory from God the Father when the voice came to Him from the Majestic Glory, saying, ‘This is My Son, Whom I love; with Him I am well pleased.' We ourselves heard this voice that came from heaven when we were with Him on the sacred mountain."