Leviticus 16:34

“In the tent of meeting, outside the veil which is before the testimony, Aaron and his sons shall keep it in order from evening to morning before Yahweh; it shall be a perpetual statute throughout their generations for the sons of Israel.

“And you shall not do any work on this same day, for it is a day of atonement, to make atonement on your behalf before Yahweh your God.

‘Then on the tenth day of this seventh month you shall have a holy convocation, and you shall humble yourselves; you shall not do any work.

but into the second, only the high priest enters once a year, not without taking blood, which he offers for himself and for the sins of the people committed in ignorance.