a more sure word of Prophecy

Psalm 18:46-50 KJV The Lord liveth; and blessed be my rock; and let the God of my salvation be exalted. [47] It is God that avengeth me, and subdueth the people under me. [48] He delivereth me from mine enemies: yea, thou liftest me up above those that rise up against me: thou hast delivered me from the violent man. [49] Therefore will I give thanks unto thee, O Lord , among the heathen, and sing praises unto thy name. [50] Great deliverance giveth he to his king; and sheweth mercy to his anointed, to David, and to his seed for evermore.