Matthew 3:16 (ESV)

16 And when Jesus was baptized, immediately he went up from the water, and behold, the heavens were opened to him, and he saw the Spirit of God descending like a dove and coming to rest on him;

Who is this? Is it Jesus or John? According to the Gospel of John, John the Baptist gave the following testimony: “I saw the Spirit come down from heaven as a dove and remain on him. I would not have known him, except that the one who sent me to baptize with water told me, ‘The man on whom you see the Spirit come down and remain is he who will baptize with the Holy Spirit.’ I have seen and I testify that this is the Son of God” (John 1:32–34). The dove is a sign merely for John the Baptist.