John Gill Commentary John 1:32

"And John bare witness, saying, I have beheld the Spirit descending as a dove out of heaven; and it abode upon him." — John 1:32 (ASV)

And John bare record
The same day that he said the above things, and at the same time:

saying, I saw the Spirit ;
that is, of God, as is said in (Matthew 3:16) and which Nonnus here expresses; and the Ethiopic version reads, "the Holy Ghost",

descending from heaven like a dove ;
at the time of his baptism; (See Gill on Matthew 3:16).

And it abode upon him ;
for some time; so long as that John had a full sight of it, and so was capable of giving a perfect account of it, and bearing a certain and distinct testimony to it.