The sin we committed at Peor was bad enough. To this very day we have not purified ourselves; it even brought a plague on the community of the Lord. ¹ 

He will become a sanctuary, ¹  but a stone that makes a person trip, and a rock that makes one stumble – to the two houses of Israel. ²  He will become ³  a trap and a snare to the residents of Jerusalem. ⁴ 

The blood will be a sign for you on the houses where you are, so that when I see ¹  the blood I will pass over you, ²  and this plague ³  will not fall on you to destroy you ⁴  when I attack ⁵  the land of Egypt. ⁶ 

“When you take a census ¹  of the Israelites according to their number, ²  then each man is to pay a ransom ³  for his life to the Lord when you number them, ⁴  so that there will be no plague among them when you number them.

I have given the Levites as a gift to Aaron and his sons from among the Israelites, to do the work for the Israelites in the tent of meeting, and to make atonement for the Israelites, so there will be no plague among the Israelites when the Israelites come near the sanctuary.” ¹ 

Then Moses said to Aaron, “Take the censer, put burning coals from the altar in it, place incense on it, and go quickly into the assembly and make atonement for them, for wrath has gone out from the Lord – the plague has begun!”

So Aaron did ¹  as Moses commanded ²  and ran into the middle of the assembly, where the plague was just beginning among the people. So he placed incense on the coals and made atonement for the people.