'Priests and Levites' in the Bible

But many of the priests and Levites and heads of the fathers' houses, who were old men, who had seen the first house, when the foundation of this house was laid before their eyes, wept with a loud voice; and many shouted aloud for joy:

I make a decree, that all they of the people of Israel, and of his priests and Levites, in my realm, who are minded of their own freewill to go up to Jerusalem, may go with you.

Also we inform you, that concerning any of the priests and Levites, singers, gatekeepers, Nethinim, or servants of this house of God, it shall not be lawful to impose toll, tribute, or custom, upon them.