Ezra 6:21 TLB

[21] And some of the heathen people who had been relocated in Judah turned from their immoral customs and joined the Israelis in worshiping the Lord God. They, with the entire nation, ate the Passover feast and celebrated the Feast of Unleavened Bread for seven days. There was great joy throughout the land because the Lord had caused the king of Assyria to be generous to Israel and to assist in the construction of the Temple.