2 Chronicles 30:13-15

13In the second month of the year, a very large crowd of people came together in Jerusalem. They came there for the Festival of Flat Bread.

14They removed the altars for false gods that were in Jerusalem. They also removed all the altars where people burned incense. They threw them into the Kidron Valley.

15On the 14th day of the second month, they killed the lamb for the Passover feast. The priests and the Levites who were not yet clean became ashamed. So they made themselves clean to serve the Lord. Then they could bring burnt offerings to the Lord's temple.