3 Bible Verses about Subdivisions

In the days of Herod the king of Judea, there was a certain priest by the name of Zachariah, of the class of Abijah; and his wife was of the daughters of Aaron, and her name was Elizabeth.

And when he was performing the priest's office in the order of his class before God, it fell to his lot,

For I wish you not to be ignorant, brothers, of this mystery; that you may not be wise in your own conceit. For hardness in part has come upon Israel, till the fullness of the gentiles shall come in,