'Son' in the Bible

concerning his Son, who was born of the seed of David according to the flesh,

who was declared to be the Son of God with power, according to the spirit of holiness, by the resurrection from the dead; even Jesus Christ our Lord,

For God is my witness, whom I serve in my spirit in the gospel of his Son, how unceasingly I make mention of you, always in my prayers

For if, while we were enemies, we were reconciled to God through the death of his Son, much more, being reconciled, shall we be saved by his life;

For what the law could not do, in that it was weak through the flesh, God, sending his own Son in the likeness of sinful flesh and for sin, condemned sin in the flesh:

For whom he foreknew, he also foreordained to be conformed to the image of his Son, that he might be the firstborn among many brethren:

He that spared not his own Son, but delivered him up for us all, how shall he not also with him freely give us all things?

For this is a word of promise, According to this season will I come, and Sarah shall have a son.