Transfiguration, Mount of means in the bible: The New Testament’s most important event was about one week after Peter promised that he would be receiving the keys to the Kingdom of Heaven Matt. 16:13-19; 17:1-9. The Savior, Moses and Elias Elijah presented the keys to the priesthood on the mount to Peter, James and John. HC 3:387 This enabled them to continue the work of God’s kingdom upon the earth following the death of Jesus. Later, all Twelve received these keys.
(in Bible Dictionary)