'Eight stringed' in the Bible

Indeed, you will bless the righteous one, LORD, like a large shield, you will surround him with favor. To the Director: With stringed instruments. On an eight-stringed harp. A Davidic Psalm

Indeed, the LORD is righteous; he loves righteousness; the upright will see him face-to-face. To the Director: On an eight stringed harp. A Davidic Psalm.