2 Chronicles 30:15-17

They killed the Passover lamb on the fourteenth day of the second month. The priests and the Levites were ashamed, so they made themselves holy and brought burnt offerings into the Temple of the LORD. They took their regular places in the Temple as the Teachings of Moses, the man of God, commanded. The Levites gave the blood of the sacrifices to the priests, who sprinkled it on the altar. Since many people in the crowd had not made themselves holy, the Levites killed the Passover lambs for everyone who was not clean. The Levites made each lamb holy for the LORD.