All these, who had been set apart as gatekeepers at the entrances, numbered 212 and had been enrolled by genealogies in their villages.

The sons of Amram: Aaron and Moses. Aaron was set apart to consecrate him as most holy, he and his sons forever, to burn incense before the Lord, attend to His service, and to bless [worshipers] in His name forever.

Moreover David and the captains of the host set apart for the service certain of the sons of Asaph, and of Heman, and of Jeduthun, who should prophesy with harps, with psalteries, and with cymbals: and the number of them that did the work according to their service was:

These who were recorded by name came in the days of King Hezekiah of Judah, attacked the Hamites’ tents and the Meunites who were found there, and set them apart for destruction, as they are today. Then they settled in their place because there was pasture for their flocks.

and addressed them: "As leaders of your Levitical families, set yourselves apart, both you and your relatives, so you can be qualified to bring up the ark of the LORD God of Israel to the place I've prepared for it.

So the priests and descendants of Levi set themselves apart to carry the ark of the LORD God of Israel.