Kehillah in Rome 9:7-9

Orthodox Jewish Bible

⁷ Nor is it as though all the banim of K’lal Yisroel are the ZERA of Avraham Avinu, but (as it is written) BEYITZCHAK YIKARE L’CHA ZERA ("In Yitzchak shall your seed be called, named, summoned" BERESHIS 21:12).

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).