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

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Egypt
Mitsrayim  (mits-rah'-yim)
Mitsrajim, i.e. Upper and Lower Egypt -- Egypt, Egyptians, Mizraim.

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in their firstborn
bkowr  (bek-ore')
firstborn; hence, chief -- eldest (son), firstborn(-ling).

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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 the Egyptians in their firstborn, For His lovingkindness is everlasting,

King James Bible
To him that smote Egypt in their firstborn: for his mercy endureth for ever:

Holman Christian Standard Bible
He struck the firstborn of the Egyptians His love is eternal.

International Standard Version
to the one who struck the firstborn of Egypt, for his gracious love is everlasting—

NET Bible
to the one who struck down the firstborn of Egypt, for his loyal love endures,

Aramaic Bible in Plain English
To him who struck the firstborn of Egypt, for his mercies are to eternity.

GOD'S WORD® Translation
Give thanks to the one who killed the firstborn males in Egypt- because his mercy endures forever.

King James 2000 Bible
To him that struck Egypt in their firstborn: for his mercy endures forever:Psalm 136:10
Psalm 136:10 NIV
Psalm 136:10 NLT
Psalm 136:10 ESV
Psalm 136:10 NASB
Psalm 136:10 KJV