NET
51 He gives his king magnificent victories; he is faithful to his chosen ruler, to David and to his descendants forever!”
Darby
51 [It is he] who giveth great deliverances to his king, And sheweth loving-kindness to his anointed, To David, and to his seed for evermore.
KJV
51 [He is] the tower of salvation for his king: and sheweth mercy to his anointed, unto David, and to his seed for evermore.