The promise the Lord had spoken through Jeremiah was about to come true in Cyrus’ first year as king of Persia. The Lord inspired the king to make this announcement throughout his whole kingdom and then to put it in writing.
This is what King Cyrus of Persia says: The Lord God of heaven has given me all the kingdoms of the world. Then he ordered me to build a temple for him in Jerusalem (which is in Judah).
In Cyrus’ third year as king of Persia, a message was revealed to Daniel (who had been renamed Belteshazzar). The message was true. It was about a great war. Daniel understood the message because he was given insight during the vision.