'Priests and Levites' in the Bible

For the priests and Levites were purified as one, all of them being purified; and they will slaughter the pass-over for all the sons of the exile, and for their brethren the priests, and for themselves.

A decree was set from me that all being willing in my kingdom, from the people of Israel and his priests and Levites, to go to Jerusalem, shall go with thee.

And making known to you that all the priests and Levites, the players, the porters, the Nethinims, and those serving this house of God, tribute, excise and toll, not being permitted to be lifted up upon them.