Ezra 8:17

And I sent them with commandment unto Iddo the chief at the place Casiphia, and I told them what they should say unto Iddo, and to his brethren the Nethinims, at the place Casiphia, that they should bring unto us ministers for the house of our God. With commandment unto Iddo the chief. Ezra sent this deputation, either by virtue of authority, which by his priestly character he had over the Levites, or of the royal commission with which he was invested. The deputation were despatched to Iddo, who was a prince or chief of the Nethinims-for the Persian government allowed the Hebrews, during their exile, to retain their ecclesiastical government by their own chiefs, as well as to enjoy the privilege of free worship, Iddo's influence procured and brought to the camp at Ahava thirty-eight Levites and 220 Nethinims, and descendants of the Gibeonites, who performed the servile duties of the temple.