Ahitub - Between Amariah and Hilkiah 1 Chronicles 6:13 this genealogy is most certainly defective, as it gives three generations only for a period for which nine generations are furnished by the list of the kings of Judah, and which cannot be estimated as much short of 200 years. Further, no one of the names in this part of the list occurs among the High priests of the period, several of whom are mentioned both in the Second Book of Chronicles and in Kings; the explanation of which seems to be that the present is not a list of high priests, but the genealogy of Jozadak or Jehozadak, whose line of descent partly coincided with the list of High priests, partly differed from it. Where it coincided, all the names are given; where it differed, some are omitted, in order (probably) to render the entire list from Phinehas a multiple of seven. See the note at 1 Chronicles 6:20.

And Azariah begat Amariah, and Amariah begat Ahitub,

6:1-81 Genealogies. - We have an account of Levi in this chapter. The priests and Levites were more concerned than any other Israelites, to preserve their descent clear, and to be able to prove it; because all the honours and privileges of their office depended upon their descent. Now, the Spirit of God calls ministers to their work, without any limit as to the families they came from; and then, as now, though believers and ministers may be very useful to the church, none but our great High Priest can make atonement for sin, nor can any be accepted but through his atonement.