Ezra 6:18-20

New Revised Standard Version, Anglicised

¹⁸ Then they set the priests in their divisions and the Levites in their courses for the service of God at Jerusalem, as it is written in the book of Moses.

The Passover Celebrated

¹⁹ On the fourteenth day of the first month the returned exiles kept the passover. ²⁰ 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.