Luke 1:7-11

But they were childless because Elizabeth was not able to conceive, and they were both very old. Once when Zechariah’s division was on duty and he was serving as priest before God, he was chosen by lot, according to the custom of the priesthood, to go into the temple of the Lord and burn incense. And when the time for the burning of incense came, all the assembled worshipers were praying outside. Then an angel of the Lord appeared to him, standing at the right side of the altar of incense.