God's "salvation" here represents the result of his salvation, which is freedom. Alternate translation: "I will save you, you will be free forever" (See: [[rc://en/ta/man/translate/figs-metonymy]])
God's "righteousness" here represents him ruling righteously. Alternate translation: "my righteous rule will never end" or "I will rule righteously forever" (See: [[rc://en/ta/man/translate/figs-metonymy]])