New Revised Standard Version
For both the priests and the Levites had purified themselves; all of them were clean. So they killed the passover lamb for all the returned exiles, for their fellow priests, and for themselves.

Contemporary English Version
The priests and Levites had gone through a ceremony to make themselves acceptable to lead in worship. Then some of them killed Passover lambs for those who had returned, including the other priests and themselves.

New American Bible
The Levites, every one of whom had purified himself for the occasion, sacrificed the Passover for all the exiles, for their colleagues the priests, and for themselves.

Douay-Rheims Bible
For all the priests and the Levites were purified as one man: all were clean to kill the phase for all the children of the captivity, and for their brethren the priests, and themselves.

For all the priests and the Levites were purified as one man: all were clean to kill the phase for all the children of the captivity, and for their brethren the priests, and themselves.

purified together

2 Chronicles 29:34 But the priests were few, and were not enough to flay the holocausts: wherefore the Levites their brethren helped them, till the work was ended, and priests were sanctified, for the Levites are sanctified with an easier rite than the priests.

2 Chronicles 30:15-17 And they immolated the phase on the fourteenth day of the second month. And the priests and the Levites being at length sanctified offered holocausts in the house of the Lord. . . .

killed

Exodus 12:21 And Moses called all the ancients of the children of Israel, and said to them: Go take a lamb by your families, and sacrifice the Phase.

2 Chronicles 35:11 And the phase was immolated: and the priests sprinkled the blood with their hand, and the Levites flayed the holocausts:

Hebrews 7:27 Who needeth not daily (as the other priests) to offer sacrifices, first for his own sins, and then for the people's: for this he did once, in offering himself.