Kehillah in Rome 9:8-10

Orthodox Jewish Bible

⁸ That is, it is not the b’nei habasar (old humanity without hitkhadshut) who are the b’nei HaElohim (children of G-d) but the b’nei HaHavtachah (children of the promise) who are reckoned as ZERA (seed, children, including the right of the heir in relation to the father).

⁹ For this word is one of havtachah (promise): KA’ET SHOV ASHUV UL’SARAH BEN ("About this time I will come and Sarah shall have a son" BERESHIS 18:10,14).

¹⁰ Not only so, but also in the case of Rivkah (Isaac’s wife) who conceived by the one act of sexual intercourse with Yitzchak Avinu.