'Son of Man' in the Bible

I saw in a vision by night, and behold, there came one in the clouds of heaven like the Son of Man - which went unto the Ancient of Days, before whom they brought him.

So he came, and stood by me. But I was afraid at his coming, and fell down upon my face. Then said he unto me, "O thou son of man, mark well, for in the last time shall this vision be fulfilled."