Exodus 25:21 "You shall put the mercy seat on top of the ark, and in the ark you shall put the testimony which I will give to you.

Exodus 28:43 "They shall be on Aaron and on his sons when they enter the tent of meeting, or when they approach the altar to minister in the holy place, so that they do not incur guilt and die. It shall be a statute forever to him and to his descendants after him.

Leviticus 22:9 'They shall therefore keep My charge, so that they will not bear sin because of it and die thereby because they profane it; I am the LORD who sanctifies them.

Numbers 4:15 "When Aaron and his sons have finished covering the holy objects and all the furnishings of the sanctuary, when the camp is to set out, after that the sons of Kohath shall come to carry them, so that they will not touch the holy objects and die. These are the things in the tent of meeting which the sons of Kohath are to carry.

Numbers 4:20 but they shall not go in to see the holy objects even for a moment, or they will die." (NASB ©1995)