2 Chronicles 30:15
15 uAnd they slaughtered the Passover lamb on the fourteenth day of the second month. vAnd the priests and the Levites were ashamed, wso that they consecrated themselves and brought burnt offerings into the house of the Lord.
Ezra 6:20
20 oFor the priests and the Levites had purified themselves together; all of them were clean. pSo they slaughtered the Passover lamb for all the returned exiles, for their fellow priests, and for themselves.