Numbers 25:13

And Aaron’s son Eleazar took one of the daughters of Putiel as a wife, and she bore him Phinehas. These are the heads of the fathers’ households of the Levites according to their families.

“You shall gird them with sashes, Aaron and his sons, and bind caps on them, and they shall have the priesthood by a perpetual statute. So you shall ordain Aaron and his sons.

So the sons of Levi did according to the word of Moses, and about three thousand men of the people fell that day.

Now it happened on the next day, that Moses said to the people, “You yourselves have committed a great sin; but now I am going up to Yahweh, perhaps I can make atonement for your sin.”

and you shall anoint them even as you have anointed their father, that they may minister as priests to Me; and their anointing will be for them for a perpetual priesthood throughout their generations.”

And Moses said to Aaron, “Take your censer and put in it fire from the altar, and lay incense on it; then bring it quickly to the congregation and make atonement for them, for wrath has gone forth from Yahweh, the plague has begun!”

Then Aaron took it as Moses had spoken, and ran into the midst of the assembly, for behold, the plague had begun among the people. So he put on the incense and made atonement for the people.

“Therefore Yahweh, the God of Israel, declares, ‘I did indeed say that your house and the house of your father should walk before Me forever’; but now Yahweh declares, ‘Far be it from Me—for those who honor Me I will honor, and those who despise Me will be cursed.

And Phinehas the son of Eleazar was ruler over them previously, and Yahweh was with him.

Remember them, O my God, because they have defiled the priesthood and the covenant of the priesthood and the Levites.

And it was counted to him for righteousness, From generation to generation forever.

“My covenant with him was one of life and peace, and I gave them to him as something to be feared; so he feared Me and stood in awe of My name.

“But as for you, you have turned aside from the way; you have caused many to stumble by the instruction; you have corrupted the covenant of Levi,” says Yahweh of hosts.

Nor let us act in sexual immorality, as some of them did, and twenty-three thousand fell in one day.