Numbers 16:45-48

45  a Get away from the midst of this congregation, that I may consume them in a moment.” b And they fell on their faces. 46 And Moses said to Aaron, “Take your censer, and put fire on it from off the altar and lay incense on it and carry it quickly to the congregation and make atonement for them, for c wrath has gone out from the  Lord; the plague has begun.” 47 So Aaron took it as Moses said and ran into the midst of the assembly. And behold, the plague had already begun among the people. And he put on the incense and made atonement for the people. 48 And he stood between the dead and the living, and d the plague was stopped.
Copyright information for ESV