Therefore will he give them up, until the time that she which travaileth hath brought forth: then the remnant of his brethren shall return unto the children of Israel. Therefore wilt he give them up - Jesus Christ shall give up the disobedient and rebellious Jews into the hands of all the nations of the earth, till she who travaileth hath brought forth; that is, till the Christian Church, represented Revelation 12:1, under the notion of a woman in travail, shall have had the fullness of the Gentiles brought in. Then the remnant of his brethren shall return; the Jews also shall be converted unto the Lord; and thus all Israel shall be saved according to Romans 11:26.
Unto the children of Israel - Taking in both families, that of Judah and that of Israel. The remnant of the ten tribes, wherever they are, shall be brought in under Christ; and though now lost among the nations of the earth, they will then not only be brought in among the fullness of the Gentiles, but most probably be distinguished as Jews.
On this verse Abp. Newcome says, "The sense is, God will not fully vindicate and exalt his people, till the virgin mother shall have brought forth her Son; and till Judah and Israel, and all the true sons of Abraham among their brethren the Gentiles, be converted to Christianity.