Ezra 8:15-20

Verse 15

The river that runneth to Ahava - Ahava was a river itself, which is supposed to be the same that is called Diava or Adiava, in the province of Adiabene; and perhaps the place whence the people of Ava came who were brought by the king of Assyria to Palestine, 2Kgs 17:24.

None of the sons of Levi - None that were simply Levites. He found priests, and they were sons of Levi; but no Levites that were not priests.
Verse 17

At the place Casiphia - The most judicious commentators are agreed that by Casiphia, the Caspian mountains, between Media and Hyrcania, are intended; where, probably, the Nethinim were employed in working silver mines: כסף keseph, from which the word comes, signifies silver.
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