Numbers 16:6

“This do, take you censers, etc.] Vessels to put incense in to offer, which was the business of the priests: Korah, and all his company; the two hundred fifty princes that were with him, for so many we read took censers, and offered incense, (<041618>Numbers 16:18,35).”

“Take your censers, Korah, and all his company, &c.--that is, since you aspire to the priesthood, then go, perform the highest function of the office--that of offering incense; and if you are accepted well. How magnanimous the conduct of Moses, who was now as willing that God's people should be priests, as formerly that they should be prophets (Num 11:29). But he warned them that they were making a perilous experiment.”

“16:6 prepare your incense burners: Korah and his company were to act like priests by burning incense (as in Lev 16:11-13); God would decide who was legitimate.”

“Num 16:35-40, Num 16:46-48; Lev 10:1, Lev 16:12, Lev 16:13; Kg1 18:21-23 Numbers 16:7”

“To leave the decision of this to the Lord, Korah and his company, who laid claim to this prerogative, were to take censers, and bring lighted incense before Jehovah. He whom the Lord should choose was to be the sanctified one. This was to satisfy them. With the expression רב־לכם in Num 16:7, Moses gives the rebels back their own words in Num 16:3. The divine decision was connected with the offering of incense, because this was the holiest function of the priestly service, which brought the priest into the immediate presence of God, and in connection with which Jehovah had already shown to the whole congregation how He sanctified Himself, by a penal judgment on those who took this office upon…”