Ezra needed Levites. (Ezra 8:16) "Then sent I for Elizer, for Ariel, for Shemaiah, and for Elnathan, and for Jarib, and for Elnathan, and for Nathan, and for Zechariah, and for Meshullam, chief men; also for Joiarib, and for Elnathan, men of understanding."
The need was great. And known leaders were called, men who had understanding of the ways of God. (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 his brethren the Nethinims, at the place Casiphia, that they should bring unto us ministers for the house of our God."
The place called 'Casiphia' is not known today. But couldn't have been far, and it would be between Babylon and Jerusalem along the way. But Ezra knew of it. He knew where to go to find ministers for the Temple. And he knew who Iddo was and that he was the leader there. It's tempting to say this is Iddo the prophet, the grand father of Zechariah the prophet. (Zechariah 1:1) "...Zechariah, the son of Berechiah, the son of Iddo the prophet...." Especially so when you see the name Zechariah in (Ezra 8:16). But, these were common names and most do not consider this 'Iddo' in (Ezra 8:17) and the Zechariah in (Ezra 8:16) as the prophets. Just can't know for sure. But both were chief men and leaders in the remnant.
And it states in (Ezra 8:17) that Ezra was explicit for these men as to what to tell Iddo concerning their need. And Iddo was faithful to respond. (Ezra 8:18) "And by the good hand of our God upon us, they brought us a man of understanding, of the sons of Mahli, the son of Levi, the son of Israel; and Sherebiah, with his sons and his brethren, eighteen. And Hashabiah, and with Jeshaiah of the sons of Merari, his brethren and their sons, twenty;" So 38 Levites were sent.
But, (Ezra 8:20) "Also of the Nethinims, whom David and the princes had appointed for the service of the Levites, two hundred and twenty Nethinims; all of them were expressed by name." These Nethinims are always listed as servants to the Levites in the ministries of the Temple. And they were faithful in their work. And this Iddo was one of them. (8:16) "....say unto Iddo, and to his brethren the Nethinims...." Ezra recognized that the Nethinims were a legitimate addition to the service of the Temple, and there were much more of them in the remnant than of Levi.
So, all toll, 258 ministers for the Temple were added to Ezra's group.
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