The idea, then of God having a son is Mosaic, and not of Nazarene origin. But we are not left to inference and implication in relation to the Christ being the Son of God. That he should be both Son of Man and Son of God -- "of man" by his mother, and "of God," by his Father -- is expressly stated in 2 Samuel 7:14; 1 Chronicles 17:13. In the Berith Olahm, or Covenant of the Aion, recorded there, Yahweh informed David that he should have a Seed or Descendant, who should be resurrected to sit upon the throne of the house of Israel; and that Yahweh would be his Father, and he, the Seed, should be His Son. Hence, David expected that the Son of the Woman who is to bruise the Serpent's Head, would descend from himself, and therefore be Son of Man; but that he would be begotten in one of his female descendants by the Spirit of Yahweh, and therefore be Son of God. This was the kind of Christ expected by David; and therefore in Psalm 110 he styles him "Lord," although His son.
(Phanerosis, Centenary Ed., page 73)