TSK · Genesis 21:10

God said,“No, Sarah your wife is going to bear you a son, and you will name him Isaac. I will confirm my covenant with him as a perpetual covenant for his descendants after him.

Abraham replied,“Because I thought,‘Surely no one fears God in this place. They will kill me because of my wife.’

But while he was still alive, Abraham gave gifts to the sons of his concubines and sent them off to the east, away from his son Isaac.

Esau took his wives, his sons, his daughters, all the people in his household, his livestock, his animals, and all his possessions which he had acquired in the land of Canaan and went to a land some distance away from Jacob his brother

I tell you, many will come from the east and west to share the banquet with Abraham, Isaac, and Jacob in the kingdom of heaven,

The slave does not remain in the family forever, but the son remains forever.

So you are no longer a slave but a son, and if you are a son, then you are also an heir through God.

that is, into an inheritance imperishable, undefiled, and unfading. It is reserved in heaven for you,