Ezra 6:21-22

So all the people of Israel who returned from captivity ate the Passover lamb. So did the people who had given up the unclean ways of their non-Jewish neighbors in order to worship the LORD, the God of Israel. For seven days they celebrated the Feast of Unleavened Bread in a very joyful way. The LORD had made them happy by changing the mind of the king of Assyria so that he helped them in the work on the Temple of the God of Israel.