King James Version (KJV)
Great deliverance giveth he to his king; and sheweth mercy to his anointed, to David, and to his seed for evermore.
Modern English
Great salvation he brings to his king, and shows steadfast love to his anointed, to David and his offspring forever.
Hebrew
מַגְדִּ֤יל ׀ יְשׁוּע֣וֹת מַ֭לְכּוֹ וְעֹ֥שֶׂה חֶ֝סֶד לִמְשִׁיח֗וֹ לְדָוִ֥ד וּלְזַרְע֗וֹ עַד עוֹלָֽם׃
magdiyl ׀ yshvʿvot malkvo vʿosheh ḥesed limshiyḥvo ldavid vlzarʿvo ʿad ʿvolam