Romans 9:7-9 they are not all children of Abraham because they are descended from Abraham. No, it is through Isaac that your offspring shall be reckoned

Moffatt⁽ⁱ⁾ ⁷ they are not all children of Abraham because they are descended from Abraham. No, it is through Isaac that your offspring shall be reckoned — ⁸ meaning that instead of God's children being the children born to him by natural descent, it is the children of the Promise who are reckoned as his true offspring. ⁹ For when God said, I will come about this time and Sara shall have a son, that was a word of promise.