Ex. 7:13 KJV (With Strong’s)

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13
And he 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
, that he hearkened
shama` (Hebrew #8085)
to hear intelligently (often with implication of attention, obedience, etc.; causatively, to tell, etc.)
KJV usage: X attentively, call (gather) together, X carefully, X certainly, consent, consider, be content, declare, X diligently, discern, give ear, (cause to, let, make to) hear(-ken, tell), X indeed, listen, make (a) noise, (be) obedient, obey, perceive, (make a) proclaim(-ation), publish, regard, report, shew (forth), (make a) sound, X surely, tell, understand, whosoever (heareth), witness.
Pronounce: shaw-mah'
Origin: a primitive root
not unto them; as 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
e had said
dabar (Hebrew #1696)
perhaps properly, to arrange; but used figuratively (of words), to speak; rarely (in a destructive sense) to subdue
KJV usage: answer, appoint, bid, command, commune, declare, destroy, give, name, promise, pronounce, rehearse, say, speak, be spokesman, subdue, talk, teach, tell, think, use (entreaties), utter, X well, X work.
Pronounce: daw-bar'
Origin: a primitive root
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Cross References

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Ex. 7:4• 4But Pharaoh shall not hearken unto you, that I may lay my hand upon Egypt, and bring forth mine armies, and my people the children of Israel, out of the land of Egypt by great judgments. (Ex. 7:4)
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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. 8:15• 15But when Pharaoh saw that there was respite, he hardened his heart, and hearkened not unto them; as the Lord had said. (Ex. 8:15)
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Ex. 10:1,20,27• 1And the Lord said unto Moses, Go in unto Pharaoh: for I have hardened his heart, and the heart of his servants, that I might show these my signs before him:
20But the Lord hardened Pharaoh's heart, so that he would not let the children of Israel go.
27But the Lord hardened Pharaoh's heart, and he would not let them go.
(Ex. 10:1,20,27)
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Ex. 14:17• 17And I, behold, I will harden the hearts of the Egyptians, and they shall follow them: and I will get me honor upon Pharaoh, and upon all his host, upon his chariots, and upon his horsemen. (Ex. 14:17)
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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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Zech. 7:11‑12• 11But they refused to hearken, and pulled away the shoulder, and stopped their ears, that they should not hear.
12Yea, they made their hearts as an adamant stone, lest they should hear the law, and the words which the Lord of hosts hath sent in his spirit by the former prophets: therefore came a great wrath from the Lord of hosts.
(Zech. 7:11‑12)
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Rom. 1:28• 28And even as they did not like to retain God in their knowledge, God gave them over to a reprobate mind, to do those things which are not convenient; (Rom. 1:28)
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Rom. 2:5• 5But after thy hardness and impenitent heart treasurest up unto thyself wrath against the day of wrath and revelation of the righteous judgment of God; (Rom. 2:5)
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Heb. 3:7‑8,13• 7Wherefore (as the Holy Ghost saith, To day if ye will hear his voice,
8Harden not your hearts, as in the provocation, in the day of temptation in the wilderness:
13But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin.
(Heb. 3:7‑8,13)

J. N. Darby Translation

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13
And Pharaoh’s heart was stubborn, and he hearkened not to them, as Jehovah had said.