Gregory of Nyssa

(Orat. in Diem Nat. Christi.) But some say that Zacharias, the father of John, by the spirit of prophecy forecasting the mystery of the immaculate virginity of the mother of God, in no wise separated her from the part of the temple set apart for virgins, wishing to shew that it was in the power of the Creator of all things to manifest a new birth, while he did not deprive the mother of the glory of her virginity. Now this part was between the altar and the temple, in which was placed the brazen altar, where for this reason they slew him. It is said also, that when they heard the King of the world was about to come, from fear of subjection they designedly attacked him who bore witness to His coming, and slew the priest in the temple.