In the Old Testament you can see Christ prophesied as David the Servant of God. In the New Testament He was anointed By God with the Spirit after baptism. He called God His God because He was the Son of Man with humanity. He called God His Father because He was the eternal Son of God, the embodiment of the Triune God. In resurrection, Christ was begotten of God as the Firstborn Son of God in His humanity, now with many brothers. In His ascension God has made Him both Lord and Christ, the King of kings, the highest of the kings of the earth. This is our Lord Jesus.

C F C
G F Am7
G F C
I have found David My Servant with My holy oil 
have I anointed Him
He will call upon Me saying My Father My God
I will make Him the Firstborn 
The highest of the kings, the highest of the kings of the earth
The highest of the kings, the highest of the kings of the earth.

David My Servant (Psalm 89:20,26,27)

Blessed be the God and Father of our Lord Jesus Christ

David My Servant (Psalm 89:20,26,27)

that1brotherinthechurch