Heaven's Explanation

Jesus Christ is not the Image of word alone, but the Image of invisible trinity God, that means in Jesus Christ we can see our Heavenly Father (I and the Father are one - John 10:30), and the Son (He who came down from heaven, that is, the Son of Man who is in heaven - John 3:13), and the Holy Spirit (if I do not go away, the Helper will not come to you - John 16:7).

That was the reason, when Christ was in the world, the Father, Word, and the Holy Spirit all three of them acknowledged Jesus Christ as Son of God in separate incident.

Acknowledgement of Holy Spirit - And when he came up out of the water, immediately he saw the heavens being torn open and the Spirit descending on him like a dove. And a voice came from heaven, You are my beloved Son; with you I am well pleased - Mark 1:10-11

Acknowledgement of Word - He was still speaking when, behold, a bright cloud overshadowed them, and a voice from the cloud said, This is my beloved Son, with whom I am well pleased; listen to him - Matthew 17:5

Acknowledgement of Father - Father, glorify your name. Then a voice came from heaven: I have glorified it, and I will glorify it again. The crowd that stood there and heard it said that it had thundered. Others said, An angel has spoken to him - John 12:28-29