NET
4 He appointed some of the Levites to serve before the ark of the Lord, to offer prayers, songs of thanks, and hymns to the Lord God of Israel.
Darby
4 And he appointed certain of the Levites to do the service before the ark of Jehovah, and to celebrate, and to thank and praise Jehovah the God of Israel:
KJV
4 And he appointed [certain] of the Levites to minister before the ark of the LORD, and to record, and to thank and praise the LORD God of Israel: