NET

20 The priests and the Levites had purified themselves, every last one, and they all were ceremonially pure. They sacrificed the Passover lamb for all the exiles, for their colleagues the priests, and for themselves.

Darby

20 For the priests and the Levites had purified themselves as one [man]: they were all pure; and they killed the passover for all the children of the captivity, and for their brethren the priests, and for themselves.

KJV

20 For the priests and the Levites were purified together, all of them [were] pure, and killed the passover for all the children of the captivity, and for their brethren the priests, and for themselves.