When the Begotten Son in the Jewish Setting, our Lord Jesus Christ came and paid the price of our redemption through His death on the cross, salvation did not end there. He waited for a descendant of the First Adam to be born in His Spirit. This descendant will bear His seed, which He already saw while He was on the cross:
Yet it pleased the Lord to bruise him; he hath put him to grief: when thou shalt make his soul an offering for sin, he shall see his seed, he shall prolong his days, and the pleasure of the Lord shall prosper in his hand.
The Appointed Son is the seed. He is the inheritor and the heir of the Father. He is the fulfillment of the Old and New Testament. He has the body of the First Adam, but with the Spirit of the second Adam.
7 He that overcometh shall inherit all things; and I will be his God, and he shall be my son.
1 God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets,
2 Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things, by whom also he made the worlds;