Numbers 16:46-48

46Then Moses told Aaron, “Take your firepan, place fire from the altar in it, and add incense. Go quickly to the community and make atonement for them, because wrath has come from the Lord; the plague has begun.”

47So Aaron took his firepan as Moses had ordered, ran into the middle of the assembly, and saw that the plague had begun among the people. After he added incense, he made atonement for the people.

48He stood between the dead and the living, and the plague was halted.