'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, Jesus Christ our Lord,

For God is my witness, whom I serve in my spirit in the Good News 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, we will be saved by his life.

For what the law couldn't do, in that it was weak through the flesh, God did, sending his own Son in the likeness of sinful flesh and for sin, he condemned sin in the flesh;

For whom he foreknew, he also predestined to be conformed to the image of his Son, that he might be the firstborn among many brothers.

He who didn't spare his own Son, but delivered him up for us all, how would he not also with him freely give us all things?

For this is a word of promise, "At the appointed time I will come, and Sarah will have a son."