Ezra 6:20

For the priests and Levites together had consecrated themselves; all of them were clean. And they slaughtered the Passover sacrifice for all of the returned exiles, for their brothers the priests, and for themselves.

2 Chronicles 35:11

And they slaughtered the Passover [lamb], and the priests sprinkled [the blood] from their hand, and the Levites flayed [the sacrifices].

2 Chronicles 29:34

But the priests were too few, and they were not able to offer all the burnt offerings, so their brothers, the Levites, strengthened them to finish the work, and until the [rest of] the priests consecrated themselves. (For the Levites [were] {more conscientious} to sanctify themselves than the priests.)

Exodus 12:21

And Moses called all the elders of Israel, and he said to them, "Select and take for yourselves sheep for your clans and slaughter the Passover sacrifice.

2 Chronicles 30:15-17

And they slaughtered the Passover lamb on the fourteenth day of the second month. And the priests and the Levites were disgraced, so they consecrated themselves and brought burnt offerings into the house of Yahweh.

Hebrews 7:27

who does not {need every day} like the former high priests to offer up sacrifices for his own sins [and] then for the [sins] of the people, because he did this once for all [when he] offered up himself.

Treasury of Scripture Knowledge

Summary

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.

Bible References

Purified together

2 Chronicles 29:34
But the priests were too few, and they were not able to offer all the burnt offerings, so their brothers, the Levites, strengthened them to finish the work, and until the [rest of] the priests consecrated themselves. (For the Levites [were] {more conscientious} to sanctify themselves than the priests.)
2 Chronicles 30:15
And they slaughtered the Passover lamb on the fourteenth day of the second month. And the priests and the Levites were disgraced, so they consecrated themselves and brought burnt offerings into the house of Yahweh.

Killed

Exodus 12:21
And Moses called all the elders of Israel, and he said to them, "Select and take for yourselves sheep for your clans and slaughter the Passover sacrifice.
2 Chronicles 35:11
And they slaughtered the Passover [lamb], and the priests sprinkled [the blood] from their hand, and the Levites flayed [the sacrifices].
Hebrews 7:27
who does not {need every day} like the former high priests to offer up sacrifices for his own sins [and] then for the [sins] of the people, because he did this once for all [when he] offered up himself.