"And after six days Jesus taketh with him Peter, and James, and John, and leadeth them up into an high mountain apart by themselves: and he was transfigured before them.
And his raiment became shining, exceeding white as snow; so as no fuller on earth can white them.
And there appeared unto them Elias with Moses: and they were talking with Jesus.
And Peter answered and said to Jesus, Master, it is good for us to be here: and let us make three tabernacles; one for thee, and one for Moses, and one for Elias.
For he wist not what to say; for they were sore afraid.
And there was a cloud that overshadowed them: and a voice came out of the cloud, saying, This is my beloved Son: hear him.
And suddenly, when they had looked round about, they saw no man any more, save Jesus only with themselves.
And as they came down from the mountain, he charged them that they should tell no man what things they had seen, till the Son of man were risen from the dead." (Mark 9:2-9 https://www.lds.org/scriptures/nt/mark/9 )
Additionally, we are told in scripture elsewhere that Peter James and John heard the voice of the Father saying that "This is my Beloved Son, in whom I am well pleased, hear ye him."
Additionally, Joseph Smith taught that the Mount of Transfiguration is where Moses, Elias, and Christ gave Peter, James and John the Keys to the Kingdom of God on this earth, keys they transferred to Joseph Smith in our modern era. (https://www.lds.org/scriptures/gs/transfiguration.p4)
Jesus Christ is the Son of God. We are told in scripture elsewhere that when Christ was on the Mount of Transfiguration, that he spoke with Moses and Elias about the sacrifice which he would "accomplish." On the mount was a preparation for the atonement which Christ knew would come.
May we ever be grateful to him, and seek him out as we go to the temple, where we may have marvellous experiences, even so sacred we do not speak of them openly.
Find out more about Christ. Along with the Bible, you can read his promises in the Book of Mormon online now at http://bit.ly/10t8QYm or get a free copy at http://bit.ly/11WKJ1G
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Picture is Transfiguration of Jesus by Carl Heinrich Bloch.