The name of the land is a metonym for the people of the land. This is probably a generalization. AT: "all the people who lived in Judah" (See: [[rc://en/ta/man/translate/figs-metonymy]] and [[rc://en/ta/man/translate/figs-hyperbole]])
This can be translated in active form. The abstract noun "trustworthy" can be translated as a verb. AT: "I knew that I could trust them" (See: [[rc://en/ta/man/translate/figs-activepassive]] and [[rc://en/ta/man/translate/figs-abstractnouns]])