Ezra 2:50

These are the people of the province who came up out of the captivity of the exiles whom Nebuchadnezzar the king of Babylon had taken away into exile, and who returned to Jerusalem and Judah, each to his city,

Now the rest of the people—the priests, the Levites, the gatekeepers, the singers, the temple servants, and all those who had separated themselves from the peoples of the lands to the law of God, their wives, their sons and their daughters—all those who had knowledge and understanding,