Q&A: Does God’s promise to Joshua and Israel in Joshua 1:9 apply to us?

By ‘us’ I’m assuming you mean the Jewish people, and specifically those living in Israel today.

You can’t cherry-pick God’s promises. Even if you accept those verses at face value, the promise is contingent upon the nation remaining faithful to God’s commandments. In the Book of Deuteronomy (chap. 28), God warns Moses: