John Gill Commentary Numbers 16:6

"This do: take you censers, Korah, and all his company;" — Numbers 16:6 (ASV)

This do, take you censers
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, (Numbers 16:18Numbers 16:35) .