4Q321

Luke begains by telling us: In the days of Herod, king of Judea, there was a priest named Zechariah, of the division of Abi'jah; and he had a wife of the daughters of Aaron, and her name was Elizabeth.

In this calendrical document, discovered at Qumran, we now have available on the internet archeological confirmation of the existence of the courses of priests with the schedule of service.

http://www.ibiblio.org/expo/deadsea.scrolls.exhibit/Library/calend.html