TSK · Numbers 1:51

And thou shalt appoint Aaron and his sons, and they shall wait on their priest's office: and the stranger that cometh nigh shall be put to death.

¶ And the LORD spake unto Moses and unto Aaron, saying,

But thus do unto them, that they may live, and not die, when they approach unto the most holy things: Aaron and his sons shall go in, and appoint them every one to his service and to his burden:

¶ And it came to pass on the twentieth [day] of the second month, in the second year, that the cloud was taken up from off the tabernacle of the testimony.

And the Kohathites set forward, bearing the sanctuary: and [the other] did set up the tabernacle against they came.

And it shall come to pass, [that] the man's rod, whom I shall choose, shall blossom: and I will make to cease from me the murmurings of the children of Israel, whereby they murmur against you.

Therefore thou and thy sons with thee shall keep your priest's office for every thing of the altar, and within the vail; and ye shall serve: I have given your priest's office [unto you] as a service of gift: and the stranger that cometh nigh shall be put to death.

¶ And he smote the men of Bethshemesh, because they had looked into the ark of the LORD, even he smote of the people fifty thousand and threescore and ten men: and the people lamented, because the LORD had smitten [many] of the people with a great slaughter.