At that time the Lord set apart the tribe of Levi to carry the ark of the Lord’s covenant, to stand before the Lord to serve him, and to formulate blessings in his name, as they do to this very day.

Then the Levitical priests will approach (for the Lord your God has chosen them to serve him and to pronounce blessings in his name, and to decide every judicial verdict)

The Lord will open for you his good treasure house, the heavens, to give you rain for the land in its season and to bless all you do; you will lend to many nations but you will not borrow from any.

The sons of Amram: Aaron and Moses. Aaron and his descendants were chosen on a permanent basis to consecrate the most holy items, to offer sacrifices before the Lord, to serve him, and to praise his name.