'Physical' in the Bible

For I could almost wish to be cursed and cut off from the Messiah for the benefit of my brothers, my own flesh and blood.

The ancestors are theirs, and from them, by physical descent, came the Messiah, who is God over all, praised forever. Amen.

That is, it is not the children by physical descent who are God’s children, but the children of the promise are considered to be the offspring.