To him which smote
nakah  (naw-kaw')
to strike (lightly or severely, literally or figuratively)

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great
gadowl  (gaw-dole')
great (in any sense); hence, older; also insolent

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

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

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endureth for ever
`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
To Him who smote great kings, For His lovingkindness is everlasting,

King James Bible
To him which smote great kings: for his mercy endureth for ever:

Holman Christian Standard Bible
He struck down great kings His love is eternal.

International Standard Version
to the one who struck down great kings, for his gracious love is everlasting—

NET Bible
to the one who struck down great kings, for his loyal love endures,

Aramaic Bible in Plain English
To him who struck great Kings, for his mercies are to eternity.

GOD'S WORD® Translation
Give thanks to the one who defeated powerful kings- because his mercy endures forever.

King James 2000 Bible
To him who struck great kings: for his mercy endures forever:Psalm 136:17
Psalm 136:17 NIV
Psalm 136:17 NLT
Psalm 136:17 ESV
Psalm 136:17 NASB
Psalm 136:17 KJV