2 Chronicles 30:13-17

A very large crowd of people assembled in Jerusalem to celebrate the Festival of Unleavened Bread in the second month. They removed the altars in Jerusalem and cleared away the incense altars and threw them into the Kidron Valley. They slaughtered the Passover lamb on the fourteenth day of the second month. The priests and the Levites were ashamed and consecrated themselves and brought burnt offerings to the temple of the LORD. Then they took up their regular positions as prescribed in the Law of Moses the man of God. The priests splashed against the altar the blood handed to them by the Levites. Since many in the crowd had not consecrated themselves, the Levites had to kill the Passover lambs for all those who were not ceremonially clean and could not consecrate their lambs to the LORD.