Ezra 7:11-13

Now this is the copy of the letter that the king Artaxerxes gave unto Ezra the priest, the scribe, even the scribe of the words of the commandments of Jehovah, and of his statutes to Israel: Artaxerxes, king of kings, unto Ezra the priest, the scribe of the law of the God of heaven, perfect and so forth. I make a decree, that all they of the people of Israel, and their priests and the Levites, in my realm, that are minded of their own free will to go to Jerusalem, go with thee.