Strong's numbers

חָזַק (H2388)

châzaq

khaw-zak'

a primitive root; to fasten upon; hence, to seize, be strong (figuratively, courageous, causatively strengthen, cure, help, repair, fortify), obstinate; to bind, restrain, conquer; aid, amend, [idiom] 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.

Brown–Driver–Briggs

חָזַק 291 vb. be or grow firm, strong, strengthen

Qal

I intrans. be or grow strong

II transit. only strengthened him not

Pi.

1 make strong (physically)

2 strengthen the hands (acc.) of anyone, sustain, encourage

3 make strong = bold, encourage

4 make firm

5 make rigid, hard, i.e. perverse, obstinate, harden

Hiph.

a make strong, strengthen

b make firm, the kingdom

c display strength

2 make severe, of battle

3 support

4 = repair

5 prevail

6 esp. take or keep hold of, seize, grasp

Hithp.

1 strengthen oneself

2 put forth strength, use one's strength

3 withstand

4 hold strongly with

From Brown, Driver, and Briggs, A Hebrew and English Lexicon of the Old Testament (1906), in the public domain.

266 occurrences

Shown in the King James Version (KJV), whichever translation you read in — it is the text these numbers are tagged against.

Exodus 8:19
Then the magicians said unto Pharaoh, This is the finger of God: and Pharaoh's heart was hardened, and he hearkened not unto them; as the LORD had said.
Exodus 9:2
For if thou refuse to let them go, and wilt hold them still,
Exodus 9:12
And the LORD hardened the heart of Pharaoh, and he hearkened not unto them; as the LORD had spoken unto Moses.
Exodus 9:35
And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the LORD had spoken by Moses.
Exodus 10:20
But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go.
Exodus 10:27
But the LORD hardened Pharaoh's heart, and he would not let them go.
Exodus 11:10
And 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.
Exodus 12:33
And the Egyptians were urgent upon the people, that they might send them out of the land in haste; for they said, We be all dead men.
Exodus 14:4
And I will harden Pharaoh's heart, that he shall follow after them; and I will be honoured upon Pharaoh, and upon all his host; that the Egyptians may know that I am the LORD. And they did so.
Exodus 14:8
And the LORD hardened the heart of Pharaoh king of Egypt, and he pursued after the children of Israel: and the children of Israel went out with an high hand.