This refers to the good news that God rescues his people. Alternate translation: "good news that because you are righteous, you rescue your people" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
Here "my lips" represents the writer, emphasizing his speech. Alternate translation: "I have not stopped myself from proclaiming these things" (See: [[rc://en/ta/man/translate/figs-metonymy]])