Jew. For what - τι γαρ, What then, if some did not believe, etc. If some of the Jewish nation have abused their privileges, and acted contrary to their obligations, shall their wickedness annul the Promise which God made to Abraham, that he would, by an everlasting covenant, be a God to him and to his seed after him? Genesis 17:7. Shall God, therefore, by stripping the Jews of their peculiar honor, as you intimate he will, falsify his promise to the nation, because some of the Jews are bad men?
For what if some did not believe? - This is to be regarded as another objection of a Jew. “What then? or what follows? if it be admitted that some of the nation did not believe, does it not follow that the faithfulness of God in his promises will fail?” The points of the objection are these:
(1)The apostle had maintained that the nation was sinful Matthew 13:23; 2 Timothy 3:10; Hosea 2:20.
Of none effect - Destroy it; or prevent him from fulfilling his promises. The meaning of the objection is, that the fact supposed, that the Jews would become unfaithful and be lost, would imply that God had failed to keep his promises to the nation; or that he had made promises which the result showed he was not able to perform.