Following are a number of back-translations of Romans 9:7:

• Uma: “It is not all the descendants of Abraham that indeed become the children of Abraham. For God’s words to Abraham are like this: ‘Only the descendants of Ishak will be your (sing.) descendants according to my promise, not your (sing.) other descendants. ‘” (Source: Uma Back Translation)
• Yakan: “And not all the descendants of Ibrahim can be called/named his real/true descendants. This is true because God said hep to Ibrahim, ‘Of your (sing.) children, only just the descendants of Isahak will I regard/consider your (sing.) descendants.'” (Source: Yakan Back Translation)
• Western Bukidnon Manobo: “As for all who are called the descendants of Abraham, not all of them are also thought of God as the true descendant of Abraham, which is to say, not all of them will receive the promises of God. For God said long ago to Abraham, He said, ‘By means only of Isaac are your true descendants.'” (Source: Western Bukidnon Manobo Back Translation)
• Kankanaey: “Neither are all who are descended-from Abraham his true grandchildren/descendants (diff. word), because God said to Abraham, ‘It is only the descendants of Isaac who will be counted as your grandchildren/descendants.'” (Source: Kankanaey Back Translation)
• Tenango Otomi: “Because God told Abraham that not all of his descendants would become God’s people. God told him: ‘Concerning the children of Isaac, only those will become God’s children’ he told him.” (Source: Tenango Otomi Back Translation)

For the Old Testament quote, see Genesis 21:12.