He is the tower
Migdowl  (mig-dole')
Migdol, a place in Egypt -- Migdol, tower.
gadal  (gaw-dal')
advance, boast, bring up, exceed, excellent, be(-come, do, give, make, wax), great(-er, come to...estate, + things), grow(up),increase, lift up, magnify(-ifical), be much set by, nourish (up), pass, promote, proudly (spoken), tower.

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of salvation
yshuw`ah  (yesh-oo'-aw)
something saved, i.e. (abstractly) deliverance; hence, aid, victory, prosperity -- deliverance, health, help(-ing), salvation, save, saving (health), welfare.

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for his king
melek  (meh'-lek)
a king -- king, royal.

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and sheweth
`asah  (aw-saw')
to do or make, in the broadest sense and widest application

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mercy
checed  (kheh'-sed)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty

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to his anointed
mashiyach  (maw-shee'-akh)
anointed; usually a consecrated person (as a king, priest, or saint); specifically, the Messiah -- anointed, Messiah.

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unto David
David  (daw-veed')
loving; David, the youngest son of Jesse -- David.

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and to his seed
zera`  (zeh'-rah)
seed; figuratively, fruit, plant, sowing-time, posterity -- carnally, child, fruitful, seed(-time), sowing-time.

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for
`ad  (ad)
especially with a preposition); as far (or long, or much) as, whether of space (even unto) or time (during, while, until) or degree (equally with)

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evermore
`owlam  (o-lawm')
concealed, i.e. the vanishing point; generally, time out of mind (past or future), i.e. (practically) eternity; frequentatively, adverbial (especially with prepositional prefix) alwaysNew American Standard Bible
"He is a tower of deliverance to His king, And shows lovingkindness to His anointed, To David and his descendants forever."

King James Bible
He is the tower of salvation for his king: and sheweth mercy to his anointed, unto David, and to his seed for evermore.

Holman Christian Standard Bible
He is a tower of salvation for His king; He shows loyalty to His anointed, to David and his descendants forever.

International Standard Version
Great is the salvation he brings to his king, showing gracious love to his anointed, to David and to his offspring forever.

NET Bible
He gives his chosen king magnificent victories; he is faithful to his chosen ruler, to David and to his descendants forever!"

GOD'S WORD® Translation
He gives great victories to his king. He shows mercy to his anointed, to David, and to his descendant forever.

King James 2000 Bible
He is the tower of salvation for his king: and shows mercy to his anointed, unto David, and to his descendants forevermore.2 Samuel 22:51
2 Samuel 22:51 NIV
2 Samuel 22:51 NLT
2 Samuel 22:51 ESV
2 Samuel 22:51 NASB
2 Samuel 22:51 KJV