Ps 2:7-8, Mt 3:16-17, Mt 14:33, Mt 16:16, Mt 17:5, Jn 1:34, Jn 20:31, Heb 1:2,8

In the Old Testament it was foretold that God would entrust the work of Christ to the Son of God. (Ps 2:7-8, Heb 1:8-9)

Ps 2:7 I will declare the decree: the Lord hath said unto me, Thou art my Son; this day have I begotten thee. 8 Ask of me, and I shall give thee the heathen for thine inheritance, and the uttermost parts of the earth for thy possession.

Heb 1:8 But unto the Son he saith, Thy throne, O God, is for ever and ever: a sceptre of righteousness is the sceptre of thy kingdom. 9 Thou hast loved righteousness, and hated iniquity; therefore God, even thy God, hath anointed thee with the oil of gladness above thy fellows.

From birth, Jesus was called the Son of God. (Lk 1:35)

Lk 1:35 And the angel answered and said unto her, The Holy Ghost shall come upon thee, and the power of the Highest shall overshadow thee: therefore also that holy thing which shall be born of thee shall be called the Son of God.

When Jesus began the work of Christ, he was called by God to be the Son of God. (Mt 3:16-17)

Mt 3:16 And Jesus, when he was baptized, went up straightway out of the water: and, lo, the heavens were opened unto him, and he saw the Spirit of God descending like a dove, and lighting upon him: 17 And lo a voice from heaven, saying, This is my beloved Son, in whom I am well pleased.

John the Baptist testified that Jesus was the Son of God. (Jn 1:34)

Jn 1:34 And I saw, and bare record that this is the Son of God.

And Jesus was called the Son of God by people because he performed miracles that only God could do. (Mt 14:33)

Mt 14:33 Then they that were in the ship came and worshipped him, saying, Of a truth thou art the Son of God.

Jesus continued to be called the Son of God. (Mt 17:5)

Mt 17:5 While he yet spake, behold, a bright cloud overshadowed them: and behold a voice out of the cloud, which s by aid, This is my beloved Son, in whom I am well pleased; hear ye him.

Only the Son of God can accomplish the work of Christ. (Mt 16:16)

Mt 16:16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God.

Only the Son of God can do the work of Christ, namely, the true king, true priest, and true prophet.

Only the Son of God can break Satan's head. (1 Jn 3:8)

Jn 3:8 The wind bloweth where it listeth, and thou hearest the sound thereof, but canst not tell whence it cometh, and whither it goeth: so is every one that is born of the Spirit.

The only sinless sacrifice for the forgiveness of our sins is the Son of God. (Heb 9:14)

Heb 9:14 How much more shall the blood of Christ, who through the eternal Spirit offered himself without spot to God, purge your conscience from dead works to serve the living God?

Only the Son of God who is with God can do the work of a true prophet. (Jn 1:1-2)

Jn 1:1 In the beginning was the Word, and the Word was with God, and the Word was God. 2 The same was in the beginning with God.

In other words, Jesus accomplished the work of Christ as the Son of God. (Jn 19:30, Jn 20:31)

Jn 19:30 When Jesus therefore had received the vinegar, he said, It is finished: and he bowed his head, and gave up the ghost.

Jn 20:31 But these are written, that ye might believe that Jesus is the Christ, the Son of God; and that believing ye might have life through his name.