Ex. 10:20 KJV (With Strong’s)

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20
But the Lord
Yhovah (Hebrew #3068)
(the) self-Existent or Eternal; Jehovah, Jewish national name of God
KJV usage: Jehovah, the Lord. Compare 3050, 3069.
Pronounce: yeh-ho-vaw'
Origin: from 1961
hardened
chazaq (Hebrew #2388)
to fasten upon; hence, to seize, be strong (figuratively, courageous, causatively strengthen, cure, help, repair, fortify), obstinate; to bind, restrain, conquer
KJV usage: aid, amend, X calker, catch, cleave, confirm, be constant, constrain, continue, be of good (take) courage(-ous, -ly), encourage (self), be established, fasten, force, fortify, make hard, harden, help, (lay) hold (fast), lean, maintain, play the man, mend, become (wax) mighty, prevail, be recovered, repair, retain, seize, be (wax) sore, strengthen (self), be stout, be (make, shew, wax) strong(-er), be sure, take (hold), be urgent, behave self valiantly, withstand.
Pronounce: khaw-zak'
Origin: a primitive root
Pharaoh’s
Par`oh (Hebrew #6547)
Paroh, a general title of Egyptian kings
KJV usage: Pharaoh.
Pronounce: par-o'
Origin: of Egyptian derivation
heart
leb (Hebrew #3820)
the heart; also used (figuratively) very widely for the feelings, the will and even the intellect; likewise for the centre of anything
KJV usage: + care for, comfortably, consent, X considered, courag(-eous), friend(-ly), ((broken-), (hard-), (merry-), (stiff-), (stout-), double) heart((-ed)), X heed, X I, kindly, midst, mind(-ed), X regard((-ed)), X themselves, X unawares, understanding, X well, willingly, wisdom.
Pronounce: labe
Origin: a form of 3824
, so that he would not let the children
ben (Hebrew #1121)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc., (like 1, 251, etc.))
KJV usage: + afflicted, age, (Ahoh-) (Ammon-) (Hachmon-) (Lev-)ite, (anoint-)ed one, appointed to, (+) arrow, (Assyr-) (Babylon-) (Egypt-) (Grec-)ian, one born, bough, branch, breed, + (young) bullock, + (young) calf, X came up in, child, colt, X common, X corn, daughter, X of first, + firstborn, foal, + very fruitful, + postage, X in, + kid, + lamb, (+) man, meet, + mighty, + nephew, old, (+) people, + rebel, + robber, X servant born, X soldier, son, + spark, + steward, + stranger, X surely, them of, + tumultuous one, + valiant(-est), whelp, worthy, young (one), youth.
Pronounce: bane
Origin: from {SI 11129}1129{/SI}
of Israel
Yisra'el (Hebrew #3478)
from 8280 and 410; he will rule as God; Jisrael, a symbolical name of Jacob; also (typically) of his posterity: --Israel.
Pronounce: yis-raw-ale'
go
shalach (Hebrew #7971)
to send away, for, or out (in a great variety of applications)
KJV usage: X any wise, appoint, bring (on the way), cast (away, out), conduct, X earnestly, forsake, give (up), grow long, lay, leave, let depart (down, go, loose), push away, put (away, forth, in, out), reach forth, send (away, forth, out), set, shoot (forth, out), sow, spread, stretch forth (out).
Pronounce: shaw-lakh'
Origin: a primitive root
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Cross References

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Ex. 4:21• 21And the Lord said unto Moses, When thou goest to return into Egypt, see that thou do all those wonders before Pharaoh, which I have put in thine hand: but I will harden his heart, that he shall not let the people go. (Ex. 4:21)
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Ex. 7:13‑14• 13And he hardened Pharaoh's heart, that he hearkened not unto them; as the Lord had said.
14And the Lord said unto Moses, Pharaoh's heart is hardened, he refuseth to let the people go.
(Ex. 7:13‑14)
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Ex. 9:12• 12And the Lord hardened the heart of Pharaoh, and he hearkened not unto them; as the Lord had spoken unto Moses. (Ex. 9:12)
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Ex. 11:10• 10And Moses and Aaron did all these wonders before Pharaoh: and the Lord hardened Pharaoh's heart, so that he would not let the children of Israel go out of his land. (Ex. 11:10)
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Deut. 2:30• 30But Sihon king of Heshbon would not let us pass by him: for the Lord thy God hardened his spirit, and made his heart obstinate, that he might deliver him into thy hand, as appeareth this day. (Deut. 2:30)
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Isa. 6:9‑10• 9And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not.
10Make the heart of this people fat, and make their ears heavy, and shut their eyes; lest they see with their eyes, and hear with their ears, and understand with their heart, and convert, and be healed.
(Isa. 6:9‑10)
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John 12:39‑40• 39Therefore they could not believe, because that Esaias said again,
40He hath blinded their eyes, and hardened their heart; that they should not see with their eyes, nor understand with their heart, and be converted, and I should heal them.
(John 12:39‑40)
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Rom. 9:18• 18Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth. (Rom. 9:18)
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2 Thess. 2:11‑12• 11And for this cause God shall send them strong delusion, that they should believe a lie:
12That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
(2 Thess. 2:11‑12)

J. N. Darby Translation

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And Jehovah made Pharaoh’s heart stubborn, and he did not let the children of Israel go.