NET

21 The Israelites who were in Jerusalem observed the Feast of Unleavened Bread for seven days with great joy. The Levites and priests were praising the Lord every day with all their might.

Darby

21 And the children of Israel, that were present at Jerusalem, held the feast of unleavened bread seven days with great gladness; and the Levites and the priests praised Jehovah day by day, with the instruments of praise to Jehovah.

KJV

21 And the children of Israel that were present at Jerusalem kept the feast of unleavened bread seven days with great gladness: and the Levites and the priests praised the LORD day by day, [singing] with loud instruments unto the LORD.