2 Samuel 22:51 KJV
He is the tower of salvation for his king: and sheweth mercy to his anointed, unto David, and to his seed for evermore.
2 Samuel 22:51, King James Version
In context
50 Therefore I will give thanks unto thee, O Lord, among the heathen, and I will sing praises unto thy name.
51 He is the tower of salvation for his king: and sheweth mercy to his anointed, unto David, and to his seed for evermore.