Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[57] So when Zorobabel had left off his discourse about truth, and the multitude had cried out aloud that he had spoken the most wisely, and that it was truth alone that had immutable strength, and such as never would wax old, the king commanded that he should ask for somewhat over and above what he had promised, for that he would give it him because of his wisdom, and that prudence wherein he exceeded the rest; "and thou shalt sit with me," said the king, "and shalt be called my cousin." When he had said this, Zorobabel put him in mind of the vow he had made in case he should ever have the kingdom. Now this vow was, "to rebuild Jerusalem, and to build therein the temple of God; as also to restore the vessels which Nebuchadnezzar had pillaged, and carried to Babylon. And this," said he, "is that request which thou now permittest me to make, on account that I have been judged to be wise and understanding."