Simeon and Levi are brothers;

Genesis 29:33-34
Again she conceived and gave birth to a son, and she said, “Because the LORD has heard that I am unloved, He has given me this son as well.” So she named him Simeon. / Once again Leah conceived and gave birth to a son, and she said, “Now at last my husband will become attached to me, because I have borne him three sons.” So he was named Levi.

Genesis 34:25-31
Three days later, while they were still in pain, two of Jacob’s sons (Dinah’s brothers Simeon and Levi) took their swords, went into the unsuspecting city, and slaughtered every male. / They killed Hamor and his son Shechem with their swords, took Dinah out of Shechem’s house, and went away. / Jacob’s other sons came upon the slaughter and looted the city, because their sister had been defiled. …

Deuteronomy 33:8-11
Concerning Levi he said: “Give Your Thummim to Levi and Your Urim to Your godly one, whom You tested at Massah and contested at the waters of Meribah. / He said of his father and mother, ‘I do not consider them.’ He disregarded his brothers and did not know his own sons, for he kept Your word and maintained Your covenant. / He will teach Your ordinances to Jacob and Your law to Israel; he will set incense before You and whole burnt offerings on Your altar. …

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their swords are weapons of violence.

Exodus 32:27-29
He told them, “This is what the LORD, the God of Israel, says: ‘Each of you men is to fasten his sword to his side, go back and forth through the camp from gate to gate, and slay his brother, his friend, and his neighbor.’” / The Levites did as Moses commanded, and that day about three thousand of the people fell dead. / Afterward, Moses said, “Today you have been ordained for service to the LORD, since each man went against his son and his brother; so the LORD has bestowed a blessing on you this day.”

Psalm 7:12-13
If one does not repent, God will sharpen His sword; He has bent and strung His bow. / He has prepared His deadly weapons; He ordains His arrows with fire.

Hosea 6:7
But they, like Adam, have transgressed the covenant; there they were unfaithful to Me.

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Joshua 5:2-3
At that time the LORD said to Joshua, “Make flint knives and circumcise the sons of Israel once again.” / So Joshua made flint knives and circumcised the sons of Israel at Gibeath-haaraloth.

Judges 9:4-5
So they gave him seventy shekels of silver from the temple of Baal-berith, with which Abimelech hired some worthless and reckless men to follow him. / He went to his father’s house in Ophrah, and on one stone murdered his seventy brothers, the sons of Jerubbaal. But Jotham, the youngest son of Jerubbaal, survived, because he hid himself.

1 Chronicles 7:21-22
Zabad his son, and Shuthelah his son. Ezer and Elead were killed by the natives of Gath, because they went down to steal their livestock. / Their father Ephraim mourned for many days, and his relatives came to comfort him.

1 Chronicles 12:1-2
Now these were the men who came to David at Ziklag, while he was still banished from the presence of Saul son of Kish (they were among the mighty men who helped him in battle; / they were archers using both the right and left hands to sling stones and shoot arrows; and they were Saul’s kinsmen from Benjamin):

2 Samuel 2:18-23
The three sons of Zeruiah were there: Joab, Abishai, and Asahel. Now Asahel was fleet of foot like a wild gazelle, / and he chased Abner, not turning to the right or to the left in his pursuit. / And Abner glanced back and said, “Is that you, Asahel?” “It is,” Asahel replied. …

2 Samuel 3:30
(Joab and his brother Abishai murdered Abner because he had killed their brother Asahel in the battle at Gibeon.)

1 Kings 2:5-6
Moreover, you know what Joab son of Zeruiah did to me—what he did to Abner son of Ner and Amasa son of Jether, the two commanders of the armies of Israel. He killed them in peacetime to avenge the blood of war. He stained with the blood of war the belt around his waist and the sandals on his feet. / So act according to your wisdom, and do not let his gray head go down to Sheol in peace.

1 Kings 2:32-33
The LORD will bring his bloodshed back upon his own head, for without the knowledge of my father David he struck down two men more righteous and better than he when he put to the sword Abner son of Ner, commander of Israel’s army, and Amasa son of Jether, commander of Judah’s army. / Their blood will come back upon the heads of Joab and his descendants forever; but for David, his descendants, his house, and his throne, there shall be peace from the LORD forever.”

Ezekiel 25:12-14
This is what the Lord GOD says: ‘Because Edom acted vengefully against the house of Judah, and in so doing incurred grievous guilt, / therefore this is what the Lord GOD says: I will stretch out My hand against Edom and cut off from it both man and beast. I will make it a wasteland, and from Teman to Dedan they will fall by the sword. / I will take My vengeance on Edom by the hand of My people Israel, and they will deal with Edom according to My anger and wrath. Then they will know My vengeance, declares the Lord GOD.’

Amos 1:11
This is what the LORD says: “For three transgressions of Edom, even four, I will not revoke My judgment, because he pursued his brother with the sword and stifled all compassion; his anger raged continually, and his fury flamed incessantly.