Charles Ellicott Commentary Numbers 16:17

"and take ye every man his censer, and put incense upon them, and bring ye before Jehovah every man his censer, two hundred and fifty censers; thou also, and Aaron, each his censer." — Numbers 16:17 (ASV)

Take every man his censer.— These censers may have been household vessels resembling censers, and available for the same purpose; or they may have been vessels which were used by the heads of houses, as priests, before the order of priesthood was restricted to the family of Aaron; or they may have been made by Korah and his company for their own use.