1 Chronicles 16:37-43 -

These verses give the now new-ordained distribution of priests and Levites, to minister and to attend to the service of praise before the ark. And the first of them may be considered to mark an important step in advance in the crystallizing of the world's ecclesiastical institutions. Asaph and his brethren of song are left there before the ark of the covenant… to minister before the ark continually, as every day's work required . A permanent local ministry and choir are thus established, with a fixity of place on Zion, and regularity of time that had been hitherto unattainable.