'Set Apart' in the Bible

Amram’s sons: Aaron and Moses.Aaron, along with his descendants, was set apart forever to consecrate the most holy things, to burn incense in the presence of Yahweh, to minister to Him, and to pronounce blessings in His name forever.

David and the officers of the army also set apart some of the sons of Asaph, Heman, and Jeduthun, who were to prophesy accompanied by lyres, harps, and cymbals. This is the list of the men who performed their service: