Psa. 105:36 KJV (With Strong’s)

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36
He 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
also all the firstborn
bkowr (Hebrew #1060)
firstborn; hence, chief
KJV usage: eldest (son), firstborn(-ling).
Pronounce: bek-ore'
Origin: from 1069
a in their land
'erets (Hebrew #776)
the earth (at large, or partitively a land)
KJV usage: X common, country, earth, field, ground, land, X natins, way, + wilderness, world.
Pronounce: eh'-rets
Origin: from an unused root probably meaning to be firm
, the chief
re'shiyth (Hebrew #7225)
the first, in place, time, order or rank (specifically, a firstfruit)
KJV usage: beginning, chief(-est), first(-fruits, part, time), principal thing.
Pronounce: ray-sheeth'
Origin: from the same as 7218
b of all their strength
'own (Hebrew #202)
ability, power, (figuratively) wealth
KJV usage: force, goods, might, strength, substance.
Pronounce: one
Origin: probably from the same as 205 (in the sense of effort, but successful)
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Cross References

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He smote.
Psa. 78:51• 51And smote all the firstborn in Egypt; the chief of their strength in the tabernacles of Ham: (Psa. 78:51)
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Psa. 135:8• 8Who smote the firstborn of Egypt, both of man and beast. (Psa. 135:8)
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Psa. 136:10• 10To him that smote Egypt in their firstborn: for his mercy endureth for ever: (Psa. 136:10)
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Ex. 4:23• 23And I say unto thee, Let my son go, that he may serve me: and if thou refuse to let him go, behold, I will slay thy son, even thy firstborn. (Ex. 4:23)
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Ex. 11:4‑5• 4And Moses said, Thus saith the Lord, About midnight will I go out into the midst of Egypt:
5And all the firstborn in the land of Egypt shall die, from the firstborn of Pharaoh that sitteth upon his throne, even unto the firstborn of the maidservant that is behind the mill; and all the firstborn of beasts.
(Ex. 11:4‑5)
;
Ex. 12:12,29‑30• 12For I will pass through the land of Egypt this night, and will smite all the firstborn in the land of Egypt, both man and beast; and against all the gods of Egypt I will execute judgment: I am the Lord.
29And it came to pass, that at midnight the Lord smote all the firstborn in the land of Egypt, from the firstborn of Pharaoh that sat on his throne unto the firstborn of the captive that was in the dungeon; and all the firstborn of cattle.
30And Pharaoh rose up in the night, he, and all his servants, and all the Egyptians; and there was a great cry in Egypt; for there was not a house where there was not one dead.
(Ex. 12:12,29‑30)
;
Heb. 11:28• 28Through faith he kept the passover, and the sprinkling of blood, lest he that destroyed the firstborn should touch them. (Heb. 11:28)
chief.

J. N. Darby Translation

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36
And he smote every firstborn in their land, the firstfruits of all their vigour.