1 Chronicles 24:6

Ithamar. All was done with the utmost order, and the priests took care to observe the regulation, till the end of the republic. (Josephus, [Antiquities?] vii. 2., and contra Apion i., and ii., and Luke i. 5.) --- The family of Eleazar had many prerogatives over the rest, as it was longer in possession of the high priesthood, and more numerous; but that of Ithamar, gave pontiffs to the nation at the time of this regulation. The Hebrew is very obscure, and is deemed incorrect. (Cap.) (Grotius) (Calmet) --- Protestants, "one principal household being taken for Eleazar, and one taken for Ithamar." --- The insertion of "one," which is in the Septuagint, removes the difficulty. (Haydock) --- The two families were enregistered alternately, (Menochius) till the eight families of Ithamar were done. (Haydock)