Exodus 32:28
“And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.”
Then Moses stood in the gate of the camp, and said, Who is on the Lord’s side? let him come unto me. And all the sons of Levi gathered themselves together unto him.
And he said unto them, Thus saith the Lord God of Israel, Put every man his sword by his side, and go in and out from gate to gate throughout the camp, and slay every man his brother, and every man his companion, and every man his neighbour.
And the children of Levi did according to the word of Moses: and there fell of the people that day about three thousand men.
For Moses had said, Consecrate yourselves to day to the Lord, even every man upon his son, and upon his brother; that he may bestow upon you a blessing this day.
And it came to pass on the morrow, that Moses said unto the people, Ye have sinned a great sin: and now I will go up unto the Lord; peradventure I shall make an atonement for your sin.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“And the earth opened her mouth, and swallowed them up, and their houses, and all the men that appertained unto Korah, and all their goods.”
“Who said unto his father and to his mother, I have not seen him; neither did he acknowledge his brethren, nor knew his own children: for they have observed thy word, and kept thy covenant.”
“And ye shall know that I have sent this commandment unto you, that my covenant might be with Levi, saith the Lord of hosts.”
“But on the morrow all the congregation of the children of Israel murmured against Moses and against Aaron, saying, Ye have killed the people of the Lord.”
“For if the word spoken by angels was stedfast, and every transgression and disobedience received a just recompence of reward;”