Verses with the word strengthen in the Old Testament (29 verses):

Deuteronomy 3:28
But charge Joshua, and encourage him, and strengthen him: for he shall go over before this people, and he shall cause them to inherit the land which thou shalt see.

Judges 16:28
And Samson called unto the LORD, and said, O Lord God, remember me, I pray thee, and strengthen me, I pray thee, only this once, O God, that I may be at once avenged of the Philistines for my two eyes.

1 Kings 20:22
And the prophet came to the king of Israel, and said unto him, Go, strengthen thyself, and mark, and see what thou doest: for at the return of the year the king of Syria will come up against thee.

Ezra 6:22
And kept the feast of unleavened bread seven days with joy: for the LORD had made them joyful, and turned the heart of the king of Assyria unto them, to strengthen their hands in the work of the house of God, the God of Israel.

Nehemiah 6:9
For they all made us afraid, saying, Their hands shall be weakened from the work, that it be not done. Now therefore, O God, strengthen my hands.

Job 16:5
But I would strengthen you with my mouth, and the moving of my lips should asswage your grief.

Psalms 20:2
Send thee help from the sanctuary, and strengthen thee out of Zion;

Psalms 27:14
Wait on the LORD: be of good courage, and he shall strengthen thine heart: wait, I say, on the LORD.

Psalms 31:24
Be of good courage, and he shall strengthen your heart, all ye that hope in the LORD.

Psalms 41:3
The LORD will strengthen him upon the bed of languishing: thou wilt make all his bed in his sickness.

Psalms 68:28
Thy God hath commanded thy strength: strengthen, O God, that which thou hast wrought for us.

Psalms 89:21
With whom my hand shall be established: mine arm also shall strengthen him.

Psalms 119:28
My soul melteth for heaviness: strengthen thou me according unto thy word.

Isaiah 22:21
And I will clothe him with thy robe, and strengthen him with thy girdle, and I will commit thy government into his hand: and he shall be a father to the inhabitants of Jerusalem, and to the house of Judah.

Isaiah 30:2
That walk to go down into Egypt, and have not asked at my mouth; to strengthen themselves in the strength of Pharaoh, and to trust in the shadow of Egypt!

Isaiah 33:23
Thy tacklings are loosed; they could not well strengthen their mast, they could not spread the sail: then is the prey of a great spoil divided; the lame take the prey.

Isaiah 35:3
Strengthen ye the weak hands, and confirm the feeble knees.

Isaiah 41:10
Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.

Isaiah 54:2
Enlarge the place of thy tent, and let them stretch forth the curtains of thine habitations: spare not, lengthen thy cords, and strengthen thy stakes;

Jeremiah 23:14
I have seen also in the prophets of Jerusalem an horrible thing: they commit adultery, and walk in lies: they strengthen also the hands of evildoers, that none doth return from his wickedness; they are all of them unto me as Sodom, and the inhabitants thereof as Gomorrah.

Ezekiel 7:13
For the seller shall not return to that which is sold, although they were yet alive: for the vision is touching the whole multitude thereof, which shall not return; neither shall any strengthen himself in the iniquity of his life.

Ezekiel 16:49
Behold, this was the iniquity of thy sister Sodom, pride, fulness of bread, and abundance of idleness was in her and in her daughters, neither did she strengthen the hand of the poor and needy.

Ezekiel 30:24
And I will strengthen the arms of the king of Babylon, and put my sword in his hand: but I will break Pharaoh's arms, and he shall groan before him with the groanings of a deadly wounded man.

Ezekiel 30:25
But I will strengthen the arms of the king of Babylon, and the arms of Pharaoh shall fall down; and they shall know that I am the LORD, when I shall put my sword into the hand of the king of Babylon, and he shall stretch it out upon the land of Egypt.

Ezekiel 34:16
I will seek that which was lost, and bring again that which was driven away, and will bind up that which was broken, and will strengthen that which was sick: but I will destroy the fat and the strong; I will feed them with judgment.

Daniel 11:1
Also I in the first year of Darius the Mede, even I, stood to confirm and to strengthen him.

Amos 2:14
Therefore the flight shall perish from the swift, and the strong shall not strengthen his force, neither shall the mighty deliver himself:

Zechariah 10:6
And I will strengthen the house of Judah, and I will save the house of Joseph, and I will bring them again to place them; for I have mercy upon them: and they shall be as though I had not cast them off: for I am the LORD their God, and will hear them.

Zechariah 10:12
And I will strengthen them in the LORD; and they shall walk up and down in his name, saith the LORD.