In my vision at night I looked, and there before me was one like a
son of man, coming with the clouds of heaven. He approached the Ancient of Days
and was led into his presence.
He was given authority,
glory and sovereign power; all nations and peoples of every language worshiped
him. His dominion is an everlasting dominion that will not pass away, and his
kingdom is one that will never be destroyed.
” (Dan. 7:13-14)

When
Jesus calls Himself the Son of Man, He is referring to this person. The Jewish
leaders knew what He was saying and did not like it.

Then will appear the sign of the Son of Man in heaven. And then all
the peoples of the earth will mourn when they see the Son of Man coming on the
clouds of heaven, with power and great glory
” (Matt. 24:30)

“Just as Moses lifted up the snake in the wilderness, so the Son of
Man must be lifted up, that everyone who believes may have eternal life in
him. For God so loved the world that he gave his one and only Son, that
whoever believes in him shall not perish but have eternal life.” (John 3:14-16)

Here
the Son of Man is identified as the only-begotten Son.