'Class' in the Bible

There was in the time of Herod, the king of Judaea, a priest of the name of Zechariah, belonging to the class of Abijah. He had a wife who was a descendant of Aaron, and her name was Elizabeth.

Now while he was doing priestly duty before God in the prescribed course of his class,

We would not dare put ourselves in the same class with, or compare ourselves to, those who recommend themselves. Whenever they measure themselves by their own standards or compare themselves among themselves, they show how foolish they are.