Lu לוּ

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Lu (Hebrew לוּ, Strong's H3863) is a Hebrew interjection meaning “if”. It occurs 22 times in 21 verses of the Old Testament.

Definition

1) if, oh that!, if only!
1a) if (unlikely condition)
1b) if only!, oh that!, would that!

From the STEPBible Brief Lexicon of Hebrew (based on the abridged Brown-Driver-Briggs), STEPBible.org, CC BY 4.0.

KJV	if (6), god (3), oh (2), thee (1), be (1), peradventure (1), would (1), haply (1), though (1)
BSB	if only (9), if (7), o (1), will please (1), what if (1), even if (1)

Every verse with Lu, with the English words that translate it highlighted (KJV or BSB; other translations show the KJV here).

Genesis 17:18
And Abraham said unto God, O that Ishmael might live before thee!And Abraham said to God, “O that Ishmael might live under Your blessing!”
Genesis 23:13
And he spake unto Ephron in the audience of the people of the land, saying, But if thou wilt give it, I pray thee, hear me: I will give thee money for the field; take it of me, and I will bury my dead there.and said to Ephron in their presence, “If you will please listen to me, I will pay you the price of the field. Accept it from me, so that I may bury my dead there.”
Genesis 30:34
And Laban said, Behold, I would it might be according to thy word.“Agreed,” said Laban. “Let it be as you have said.”
Genesis 50:15
And when Joseph’s brethren saw that their father was dead, they said, Joseph will peradventure hate us, and will certainly requite us all the evil which we did unto him.When Joseph’s brothers saw that their father was dead, they said, “What if Joseph bears a grudge? Then he will surely repay us for all the evil that we did to him.”

Numbers 14:2
And all the children of Israel murmured against Moses and against Aaron: and the whole congregation said unto them, Would God that we had died in the land of Egypt! or would God we had died in this wilderness!All the Israelites grumbled against Moses and Aaron, and the whole congregation said to them, “If only we had died in the land of Egypt, or if only we had died in this wilderness!
Numbers 20:3
And the people chode with Moses, and spake, saying, Would God that we had died when our brethren died before the Lord!The people quarreled with Moses and said, “If only we had perished with our brothers before the LORD!
Numbers 22:29
And Balaam said unto the ass, Because thou hast mocked me: I would there were a sword in mine hand, for now would I kill thee.Balaam answered the donkey, “You have made a fool of me! If I had a sword in my hand, I would kill you right now!”

Deuteronomy 32:29
O that they were wise, that they understood this, that they would consider their latter end!If only they were wise, they would understand it; they would comprehend their fate.

Joshua 7:7
And Joshua said, Alas, O Lord God, wherefore hast thou at all brought this people over Jordan, to deliver us into the hand of the Amorites, to destroy us? would to God we had been content, and dwelt on the other side Jordan!“O, Lord GOD,” Joshua said, “why did You ever bring this people across the Jordan to deliver us into the hand of the Amorites to be destroyed? If only we had been content to stay on the other side of the Jordan!

Judges 8:19
And he said, They were my brethren, even the sons of my mother: as the Lord liveth, if ye had saved them alive, I would not slay you.“They were my brothers,” Gideon replied, “the sons of my mother! As surely as the LORD lives, if you had let them live, I would not kill you.”
Judges 13:23
But his wife said unto him, If the Lord were pleased to kill us, he would not have received a burnt offering and a meat offering at our hands, neither would he have shewed us all these things, nor would as at this time have told us such things as these.But his wife replied, “If the LORD had intended to kill us, He would not have accepted the burnt offering and the grain offering from our hands, nor would He have shown us all these things or spoken to us this way.”

1 Samuel 14:30
How much more, if haply the people had eaten freely to day of the spoil of their enemies which they found? for had there not been now a much greater slaughter among the Philistines?How much better it would have been if the troops had eaten freely today from the plunder they took from their enemies! Would not the slaughter of the Philistines have been much greater?”

2 Samuel 18:12
And the man said unto Joab, Though I should receive a thousand shekels of silver in mine hand, yet would I not put forth mine hand against the king’s son: for in our hearing the king charged thee and Abishai and Ittai, saying, Beware that none touch the young man Absalom.The man replied, “Even if a thousand shekels of silver were weighed out into my hands, I would not raise my hand against the son of the king. For we heard the king command you and Abishai and Ittai, ‘Protect the young man Absalom for my sake.’
2 Samuel 19:6
In that thou lovest thine enemies, and hatest thy friends. For thou hast declared this day, that thou regardest neither princes nor servants: for this day I perceive, that if Absalom had lived, and all we had died this day, then it had pleased thee well.You love those who hate you and hate those who love you! For you have made it clear today that the commanders and soldiers mean nothing to you. I know today that if Absalom were alive and all of us were dead, it would have pleased you!

Job 6:2
Oh that my grief were throughly weighed, and my calamity laid in the balances together!“If only my grief could be weighed and placed with my calamity on the scales.
Job 16:4
I also could speak as ye do: if your soul were in my soul’s stead, I could heap up words against you, and shake mine head at you.I could also speak like you if you were in my place; I could heap up words against you and shake my head at you.

Psalm 81:13
Oh that my people had hearkened unto me, and Israel had walked in my ways!If only My people would listen to Me, if Israel would follow My ways,

Isaiah 48:18
O that thou hadst hearkened to my commandments! then had thy peace been as a river, and thy righteousness as the waves of the sea:If only you had paid attention to My commandments, your peace would have been like a river, and your righteousness like waves of the sea.
Isaiah 64:1
Oh that thou wouldest rend the heavens, that thou wouldest come down, that the mountains might flow down at thy presence,If only You would rend the heavens and come down, so that mountains would quake at Your presence,

Ezekiel 14:15
If I cause noisome beasts to pass through the land, and they spoil it, so that it be desolate, that no man may pass through because of the beasts:Or if I send wild beasts through the land to leave it childless and desolate, with no man passing through it for fear of the beasts,

Micah 2:11
If a man walking in the spirit and falsehood do lie, saying, I will prophesy unto thee of wine and of strong drink; he shall even be the prophet of this people.If a man of wind were to come and say falsely, “I will preach to you of wine and strong drink,” he would be just the preacher for this people!

Definition and verse list from STEPBible's tagged Hebrew Old Testament (TAHOT) and Greek New Testament (TAGNT) and Brief Lexicons, STEPBible.org, CC BY 4.0.
English renderings from the public-domain KJV with Strong's numbers (eBible.org) and the Berean Standard Bible interlinear (public domain).