John said in John 1:31, "...but the reason I came baptizing with water was that He might be revealed to Israel," and the One who sent him to baptize with water had told him, 'The man whom you see the Spirit descend and rest is He who will baptize with the Holy Spirit (John1:33)." And this John testifies of seeing (John1:32).
And when Jesus came out of the water, ...the heavens were opened, and He saw the heavens open, and the Spirit of God descending like a dove and rested on Him, and a voice from heave said, 'This is My beloved Son, in whom I am well pleased.'
Jesus is our high priest, who (now) baptizes (the baptism that now saves us).