Psalms 18:50

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.

Great deliverance giveth he to his king; and sheweth mercy to his anointed, to David, and to his seed for evermore.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: Great salvation He brings to His king. He shows loving devotion to His anointed, to David and his descendants forever.
KJV: Great deliverance giveth he to his king; and sheweth mercy to his anointed, to David, and to his seed for evermore.
WEB: He gives great deliverance to his king, and shows loving kindness to his anointed, to David and to his offspring, forever more.
ASV: Great deliverance giveth he to his king, And showeth lovingkindness to his anointed, To David and to his seed, for evermore. Psalm 19 For the Chief Musician. A Psalm of David.
DARBY: [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.
BLB: He is making great the salvation of His king and showing loving devotion to His anointed, of David and to his seed, even to forever.

ÅB: Han gjør redningen stor for sin utvalgte konge,
han viser trofast kjærlighet til sin salvede,
mot David og mot hans slekt til evig tid.
OTB: Han gir stor frelse til sin konge,
Og viser trofast kjærlighet til sin salvede,
Til David og hans etterkommere for alltid.
B1930: Han gjør frelsen stor for sin konge, han gjør miskunnhet mot sin salvede, mot David og mot hans ætt til evig tid.

Psalms 144:10
It is he that giveth salvation unto kings: who delivereth David his servant from the hurtful sword.
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Psalms 132:10
For thy servant David’s sake turn not away the face of thine anointed.
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2 Samuel 7:13
He shall build an house for my name, and I will stablish the throne of his kingdom for ever.
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Psalms 89:3–4
I have made a covenant with my chosen, I have sworn unto David my servant,
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Romans 11:29
For the gifts and calling of God are without repentance.
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Luke 1:31–33
And, behold, thou shalt conceive in thy womb, and bring forth a son, and shalt call his name JESUS.
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Acts 2:34–36
For David is not ascended into the heavens: but he saith himself, The LORD said unto my Lord, Sit thou on my right hand,
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Isaiah 9:6–7
For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counsellor, The mighty God, The everlasting Father, The Prince of Peace.
Read in context