Psalm 18:50
"Great deliverance giveth he to his king; and sheweth mercy to his anointed, to David, and to his seed for evermore."
Cross References (ranked by relevance)
It is he that giveth salvation unto kings: who delivereth David his servant from the hurtful sword.
He shall build an house for my name, and I will stablish the throne of his kingdom for ever.
For thy servant David’s sake turn not away the face of thine anointed.
For the gifts and calling of God are without repentance.
And hath raised up an horn of salvation for us in the house of his servant David;
Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ.
The adversaries of the LORD shall be broken to pieces; out of heaven shall he thunder upon them: the LORD shall judge the ends of the earth; and he shall give strength unto his king, and exalt the horn of his anointed.
Yet have I set my king upon my holy hill of Zion.
Now therefore let it please thee to bless the house of thy servant, that it may be before thee for ever: for thou blessest, O LORD, and it shall be blessed for ever.
Concerning his Son Jesus Christ our Lord, which was made of the seed of David according to the flesh;
And the LORD said unto Samuel, How long wilt thou mourn for Saul, seeing I have rejected him from reigning over Israel? fill thine horn with oil, and go, I will send thee to Jesse the Bethlehemite: for I have provided me a king among his sons.