TSK · Nehemiah 12:30

Then Jacob said to his household, and to all who were with him, "Put away the foreign gods that are among you, purify yourselves, change your garments.

He said to the people, "Be ready by the third day. Don't have sexual relations with a woman."

So the priests and the Levites sanctified themselves to bring up the ark of Yahweh, the God of Israel.

But the priests were too few, so that they could not flay all the burnt offerings: therefore their brothers the Levites helped them, until the work was ended, and until the priests had sanctified themselves; for the Levites were more upright in heart to sanctify themselves than the priests.

I commanded the Levites that they should purify themselves, and that they should come and keep the gates, to sanctify the Sabbath day. Remember to me, my God, this also, and spare me according to the greatness of your loving kindness.

It was so, when the days of their feasting had run their course, that Job sent and sanctified them, and rose up early in the morning, and offered burnt offerings according to the number of them all. For Job said, "It may be that my sons have sinned, and renounced God in their hearts." Job did so continually.

Because of this, he must offer sacrifices for sins for the people, as well as for himself.