There was in the days of Herod, the king of Judaea, a certain priest named Zacharias, of the course of Abia: and his wife was of the daughters of Aaron, and her name was Elisabeth. In the days of Herod, the king - This was Herod, surnamed the Great, the son of Antipater, an Idumean by birth, who had professed himself a proselyte to the Jewish religion, but regarded no religion, farther than it promoted his secular interests and ambition. Thus, for the first time, the throne of Judah was filled by a person not of Jewish extraction, who had been forced upon the people by the Roman government. Hence it appears plain that the prophecy of Jacob, Genesis 49:10, was now fulfilled; for the scepter had departed from Judah: and now was the time, according to another prophecy, to look for the governor from Bethlehem, who should rule and feed the people of Israel: Micah 5:1, Micah 5:2. See a large account of the family of the Herods, in the note on Matthew 2:1 (note). This was before Christ six years.
The course of Abiah - When the sacerdotal families grew very numerous, so that all could not officiate together at the tabernacle, David divided them into twenty-four classes, that they might minister by turns, 1 Chronicles 24:1, etc., each family serving a whole week, 2 Kings 11:7; 2 Chronicles 23:8. Abiah was the eighth in the order in which they had been originally established: 1 Chronicles 24:10. These dates and persons are particularly mentioned as a full confirmation of the truth of the facts themselves; because any person, at the time this Gospel was written, might have satisfied himself by applying to the family of John the Baptist, the family of our Lord, or the surrounding neighbors. What a full proof of the Gospel history! It was published immediately after the time in which these facts took place; and among the very people, thousands of whom had been eye-witnesses of them; and among those, too, whose essential interest it was to have discredited them if they could; and yet, in all that age, in which only they could have been contradicted with advantage, no man ever arose to call them in question! What an absolute proof was this that the thing was impossible; and that the truth of the Gospel history was acknowledged by all who paid any attention to the evidences it produced!
Of the daughters of Aaron - That is, she was of one of the sacerdotal families. This shows that John was most nobly descended: his father was a priest and his mother the daughter of a priest; and thus, both by father and mother, he descended from the family of Amram, of whom came Moses, Aaron, and Miriam, the most illustrious characters in the whole Jewish history.