“For unto which of the angels said he at any time, Thou art my Son, this day have I begotten thee? And again, I will be to him a Father, and he shall be to me a Son?”
King James Version (KJV)
1:5 Thou art my Son - God of God, Light of Light. This day have I begotten thee - I have begotten thee from eternity, which, by its unalter able permanency of duration, is one continued, unsuccessive day. I will be to him a Father, and he shall be to me a Son - I will own myself to be his Father, and him to be my Son, by eminent tokens of my peculiar love The former clause relates to his natural Sonship, by an eternal, inconceivable generation; the other, to his Father's acknowledgment and treatment of him as his incarnate Son. Indeed this promise related immediately to Solomon, but in a far higher sense to the Messiah. #Psa 2:7|; 2Sam 7:14
Heb 1:5 For to which of the angels said he at any time. To none of them did he ever use such language as follows. The style in which the Father addresses Christ shows his superiority to the angels. Thou art my Son. See Ps 2:7. The second Psalm was regarded by the Jews as a prophecy of the Messiah. This day have I begotten thee. What day is referred to in the prophecy? Ac 13:32,33 answers the question by quoting this very passage and declaring that it was fulfilled in the resurrection of Christ from the dead. He was born from the dead and God, who raised him, thus demonstrated that he was his Son. And again, I will be to him a Father, and he shall be to me a Son? Quoted from 2Sa 7:14. They were spoken originally of David's son Solomon, chosen to be king after him, but he was in a certain sense a type of Christ. The expressions "Son of David" and "Seed of David" while applicable to Solomon, pre-eminently refers to Christ. See Mt 1:1 Mr 10:47 Lu 18:38 Joh 7:42 Ro 1:3 2Ti 2:8.