To be taxed with Mary his espoused wife, being great with child.
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Cyril of Alexandria
AD 444
The sacred Evangelist says that Mary was betrothed to Joseph, to shew that the conception had taken place upon her betrothal solely, and that the birth of the Emanuel was miraculous, and not in accordance with the laws of nature. For the holy Virgin did not bear from the immission of man's seed. And what was the reason of this? Christ, Who is the first-fruits of all, the second Adam according to the Scriptures, was born of the Spirit, that he might transmit the grace (of the spiritual birth) to us also: for we too were intended, no longer to bear the name of sons of men, but of God rather, having obtained the new birth of the Spirit in Christ first, that he might be "foremost among all," as the most wise Paul declares.
And the occasion of the census most opportunely caused the holy Virgin to go to Bethlehem, that we might see another |9 prophecy fulfilled. For it is written, as we have already mentioned, "And thou Bethlehem, house of Ephratah, art very small to be among the thousands of Judah: from thee shall come forth for Me to be Ruler in Israel!"
But in answer to those who argue that, if He were brought forth in the flesh, the Virgin was corrupted: and if she were not corrupted, that He was brought forth only in appearance, we say; the prophet declares, "the Lord, the God of Israel, hath entered in and gone out, and the gate remaineth closed." If, moreover, the Word was made flesh without sexual intercourse, being conceived altogether without seed, then was He born without injury to her virginity.