There was in the days of Herod, the king of Judea, a certain priest named Zachariah, of the course of Abia: and his wife was of the daughters of Aaron, and her name was Elizabeth.
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Bede
AD 735
We must note that the angel bore witness to the grace about which he had come to give the good news—not only by the power of the words which he brought forward but also by the point in time and the location of the place in which he appeared. He appeared at the time when the priest was making an offering to express the fact that he was proclaiming the coming of the true and eternal high priest, who would be the true sacrificial offering for the salvation of the world. He stood beside the altar of incense to teach that he had come as the herald of a new covenant. There were two altars in the temple, which expressed the two covenants in the church. The first, the altar of burnt offerings, which was plated with bronze and was situated in front of the doors of the temple, was for the offering up of victims and sacrifices. It signified the fleshlyminded worshipers of the old covenant. Then there was the altar of incense, which was covered with gold and set near the entrance of the Holy of Holies, and was used to burn fragrant gums. This signified the interior and more perfect grace of the new covenant and its worshipers.