Numbers 16:39-40

Brenton(i) 39 And Eleazar the son of Aaron the priest took the brazen censers, which the men who had been burnt brought near, and they put them as a covering on the altar: 40 a memorial to the children of Israel that no stranger might draw nigh, who is not of the seed of Aaron, to offer incense before the Lord; so he shall not be as Core and as they that conspired with him, as the Lord spoke to him by the hand of Moses.