1 Chronicles 15:12

So kill the passover, and sanctify yourselves, and prepare your brethren, that they may do according to the word of the LORD by the hand of Moses.

Then they killed the passover on the fourteenth day of the second month: and the priests and the Levites were ashamed, and sanctified themselves, and brought in the burnt offerings into the house of the LORD.

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

And it came to pass, when the priests were come out of the holy place: (for all the priests that were present were sanctified, and did not then wait by course:

These likewise cast lots over against their brethren the sons of Aaron in the presence of David the king, and Zadok, and Ahimelech, and the chief of the fathers of the priests and Levites, even the principal fathers over against their younger brethren.

These chief fathers of the Levites were chief throughout their generations; these dwelt at Jerusalem.

Sanctify them through thy truth: thy word is truth.

And David gathered all Israel together to Jerusalem, to bring up the ark of the LORD unto his place, which he had prepared for it.

It shall be for the priests that are sanctified of the sons of Zadok; which have kept my charge, which went not astray when the children of Israel went astray, as the Levites went astray.

And David made him houses in the city of David, and prepared a place for the ark of God, and pitched for it a tent.