After the World of Adam became corrupted as a result of betraying God (Gn 6), God anointed Adam’s ninth descendent (Gn 5:29-31), Noah, and swept the world of Adam away with a flood.
As Ham and Canaan sinned against God (Gn 9), God came to Abraham who was the tenth descendent of Noah (Gn 11:26) and told him of things to come (Gn 15). As prophesied, a descendent of Abraham, Jacob, went into Egypt. And only after four generations, God chose a specific Levite (Moses) among many others (Ex 2:1-10, Ex 6:16-20, Nm 26:58-59) and ordered him to exit out of Egypt with the Israelites. God then lead the Israelites into the land of Canaan through Joshua (Jo 1:1-4) and gave them the strength needed to conquer the native people of Canaan. Joshua then divided the conquered land into the twelve different tribes of Israel.
King Solomon was given a wise and discerning heart from God. Even though, he still began to serve gentile gods (1Kgs 11), and as a result Israel was divided into north and south. The eleven tribes of North Israel were destroyed like Canaan. Even the last remaining tribe, South Judah and Jerusalem, also became destroyed during the reign of Zedekiah (Isa 1, Jer 1:3, 2 Kgs 25).
Since that time, God made promises through the Old Testament prophets to be keep in the future. God then came to Jesus and fulfilled the Old Testament (Jn 19:30). There were fourteen generations in all from Abraham to David, fourteen from David to the exile to Babylon, and fourteen from the exile to Christ. Jesus was born of the Holy Spirit (Mt 1), not through a physical seed. From the time of Jesus, those who are born not of natural descent, nor of human decision (Jn 1:13), but born of the seed of God (Lk 8:11) are considered the children of God. From the time of Adam to Jesus, people born by a physical bloodline were considered the chosen people. However, after Jesus, those who born, not by a physical bloodline, but born of the seed of God became the children of God.
This seed was sown by Jesus in this world and Jesus promised his return at the time of harvest (Rv 7, 14) to establish God’s new kingdom and nation, and He is accomplishing this work today.
The chosen people born by the physical gene of Adam, who are those born into sin, ended at the time of John the Baptist (Mt 11:12-13, Lk 16:16). After the time of Jesus, Spiritual Israel, who are those born through God’s seed was created. Any of the Spiritual Israelites who are not harvested at the time of the fulfillment of Revelation will be destroyed. But people who are born by the seed of God, harvested, and sealed will be the kingdom of God and His priests of the new generation. They will participate in the first resurrection and rule over the nations forever (Jas 1:18, Rv 20, 21).