Charles Ellicott Commentary Numbers 16:46

"And Moses said unto Aaron, Take they censer, and put fire therein from off the altar, and lay incense thereon, and carry it quickly unto the congregation, and make atonement for them: for there is wrath gone out from Jehovah; the plague is begun." — Numbers 16:46 (ASV)

Take a censer.— Better, the censer. The reference appears to be to the golden censer of the high priest. Incense was an emblem of prayer, and a figure of the intercession and mediation of Christ. (Revelation 8:3–4.)

And go quickly.— Or, and carry it quickly.