God is the original Promise Keeper. Romans 3:3-4

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It doesn't matter
what the Jews have done nor what antisemites say about them. If God didn't
keep his promises to Israel, to the physical descendants of Jacob, what kind
of God would he be? How could we trust him to keep any of his promises? Or
not to change the rules whenever he felt like it? The only hope of
forgiveness for sins to escape eternal damnation lies in God's character as a
promise keeper.