His king — To the king whom God himself chose and anointed, and to all his posterity; and especially to the Messiah, who is called David's seed, Acts 13:23; Romans 1:3.
Related Commentaries of Psalms 18:50
Psalms 18:50
50 Great deliverance giveth he to his king; and sheweth mercy to his anointed, to David, and to his seed for evermore.