Psa. 136:10 KJV (With Strong’s)

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10
Tob him that smote
nakah (Hebrew #5221)
to strike (lightly or severely, literally or figuratively)
KJV usage: beat, cast forth, clap, give (wounds), X go forward, X indeed, kill, make (slaughter), murderer, punish, slaughter, slay(-er, -ing), smite(-r, -ing), strike, be stricken, (give) stripes, X surely, wound.
Pronounce: naw-kaw'
Origin: a primitive root
Egypt
Mitsrayim (Hebrew #4714)
Mitsrajim, i.e. Upper and Lower Egypt
KJV usage: Egypt, Egyptians, Mizraim.
Pronounce: mits-rah'-yim
Origin: dual of 4693
in their firstborn
bkowr (Hebrew #1060)
firstborn; hence, chief
KJV usage: eldest (son), firstborn(-ling).
Pronounce: bek-ore'
Origin: from 1069
: for his mercy
checed (Hebrew #2617)
kindness; by implication (towards God) piety: rarely (by opposition) reproof, or (subject.) beauty
KJV usage: favour, good deed(-liness, -ness), kindly, (loving-)kindness, merciful (kindness), mercy, pity, reproach, wicked thing.
Pronounce: kheh'-sed
Origin: from 2616
endureth for ever
`owlam (Hebrew #5769)
from 5956; properly, concealed, i.e. the vanishing point; generally, time out of mind (past or future), i.e. (practically) eternity; frequentatively, adverbial (especially with prepositional prefix) always
KJV usage: alway(-s), ancient (time), any more, continuance, eternal, (for, (n-))ever(-lasting, -more, of old), lasting, long (time), (of) old (time), perpetual, at any time, (beginning of the) world (+ without end). Compare 5331, 5703.
Pronounce: o-lawm'
Origin: or lolam {o-lawm'}
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Cross References

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J. N. Darby Translation

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10
To him that smote Egypt in their firstborn, for his loving-kindness endureth for ever,