20 For the priests and the Levites had purified themselves together; all of them were pure; and they killed the passover lamb for all the children of the captivity, and for their brethren the priests, and for themselves.
Ezra 6:20 Cross References - JPS_ASV_Byz
Exodus 12:21
21 Then Moses called for all the elders of Israel, and said unto them: 'Draw out, and take you lambs according to your families, and kill the passover lamb.
2 Chronicles 29:34
34 But the priests were too few, so that they could not flay all the burnt-offerings; wherefore their brethren the Levites did help them, till the work was ended, and until the priests had sanctified themselves; for the Levites were more upright in heart to sanctify themselves than the priests.
2 Chronicles 30:15-17
15 Then they killed the passover lamb on the fourteenth day of the second month; and the priests and the Levites were ashamed, and sanctified themselves, and brought burnt-offerings into the house of the LORD.
16 And they stood in their place after their order, according to the law of Moses the man of God; the priests dashed the blood, which they received of the hand of the Levites.
17 For there were many in the congregation that had not sanctified themselves; therefore the Levites had the charge of killing the passover lambs for every one that was not clean, to sanctify them unto the LORD.
2 Chronicles 35:11
11 And they killed the passover lamb, and the priests dashed the blood, which they received of their hand, and the Levites flayed them.
Hebrews 7:27
27 who needeth not daily, like those high priests, to offer up sacrifices, first for his own sins, and then for the sins of the people; for this he did once for all, when he offered up himself.