'Separate' in the Bible

The sons of Amram: Aaron and Moses; and Aaron was made separate and holy, he and his sons for ever, for the care of the most holy things and the burning of offerings before the Lord, to do his work and give blessings in his name for ever.

And David and the heads of the host separate for service, of the sons of Asaph, and Heman, and Jeduthun, who are prophesying with harps, with psalteries, and with cymbals, and the number of the workmen is according to their service.