Luke 1:5-8, 11

In the days of Herod, king of Judea, there was a priest named Zechariah, of the division of Abijah. And he had a wife from the daughters of Aaron, and her name was Elizabeth. And they were both righteous before God, walking blamelessly in all the commandments and statutes of the Lord. But they had no child, because Elizabeth was barren, and both were advanced in years. Now while he was serving as priest before God when his division was on duty

And there appeared to him an angel of the Lord standing on the right side of the altar of incense.