Numbers 4:16-20

16"And Eleazar the son of Aaron the priest shall have charge of the oil for the light, the fragrant incense, the regular grain offering, and the anointing oil, with the oversight of the whole tabernacle and all that is in it, of the sanctuary and its vessels."

17The Lord spoke to Moses and Aaron, saying,

18"Let not the tribe of the clans of the Kohathites be destroyed from among the Levites,

19but deal thus with them, that they may live and not die when they come near to the most holy things: Aaron and his sons shall go in and appoint them each to his task and to his burden,

20but they shall not go in to look on the holy things even for a moment, lest they die."