Ezra 5:5-6

But the eye of their God was upon the elders of the Jews, that they could not cause them to cease, till the matter came to Darius: and then they returned answer by letter concerning this matter. The copy of the letter that Tatnai, governor on this side the river, and Shethar-boznai, and his companions the Apharsachites, which were on this side the river, sent unto Darius the king