1 Chronicles 23:13
23:13 The sons of Amram; Aaron and Moses: and Aaron was
      separated, that he should {a} sanctify the most holy
      things, he and his sons for ever, to burn incense before
      the LORD, to minister unto him, and to bless in his name
      for ever.

      (a) That is, to serve in the most holy place, and to
          consecrate the holy things.

1 Chronicles 23:14
23:14 Now [concerning] Moses the man of God, his sons were named
      of the {b} tribe of Levi.

      (b) They were but of the order of the Levites and not of
          the priests as Aaron's sons.

1 Chronicles 23:17
23:17 And the sons of Eliezer [were], Rehabiah the {c} chief.
      And Eliezer had none other sons; but the sons of Rehabiah
      were very many.

      (c) The scripture calls him chief or first born even
          though he is alone and there is no one born after him,
          Matthew 1:25.

1 Chronicles 23:22
23:22 And Eleazar died, and had no sons, but daughters: and
      their {d} brethren the sons of Kish took them.

      (d) Meaning their cousins.

1 Chronicles 23:24
23:24 These [were] the sons of Levi after the house of their
      fathers; [even] the chief of the fathers, as they were
      counted by number of names by their polls, that did the
      work for the service of the house of the LORD, from the
      age of {e} twenty years and upward.

      (e) David chose the Levites twice, first at the age of
          thirty as in 1 Chronicles 23:3 and again afterward at
          twenty as the office required: at the beginning they
          had no charge in the temple before they were
          twenty-five years old, and had none after fifty,
          Numbers 4:3.

1 Chronicles 23:28
23:28 Because their office [was] to wait on the sons of Aaron
      for the service of the house of the LORD, in the courts,
      and in the chambers, and in the {f} purifying of all holy
      things, and the work of the service of the house of God;

      (f) In washing and cleansing all the holy vessels.