2 Samuel 7.14
Septuagint

egw esomai autw eiV patera, 
kai autoV estai moi eiV uion

 

New Testament - 2 Corinthians 6.18

kai esomai umin eiV patera 
kai umeiV esesqe moi eiV uiouV 
kai qugateraV

Hebrews 1.5

egw esomai autw eiV patera, 
kai autoV estai moi eiV uion; 

Septuagint

I will be to him a father, and he shall be to me a son
 

New Testament

2 Corinthians 6.18:  And will be to you a Father, And ye shall be to me as sons and daughters

Hebrews 1.5I will be to him a Father, and he shall be to me a Son?

Masoretic Text

I will be his father, and he shall be my son

Comments:  The NT, LXX and MT agree.