And knew her not till she had brought forth her firstborn son: and he called his name JESUS.
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Chromatius of Aquileia
But concerning what the Evangelist said, “And he did not know her till she had borne her firstborn son,” not a few careless people insist on asking whether after the Lord’s birth the holy mother Mary had relations with Joseph. But this is not admissible on the grounds of either faith or truth. Far be it indeed that after the sacrament of so great a mystery and after the birth of the sublime Lord, one should believe that the Virgin Mary was intimate with a man. Remember that Miriam the prophetess of the Old Testament (the sister of Moses and Aaron) remained a virgin unsullied by man, having beheld the light of heavenly signs after the plagues of Egypt and the parting of the Red Sea and the Lord’s glory going in advance and seen in a pillar of fire and clouds. It is not plausible therefore that the Mary of the Gospel, a virgin bearing God, who beheld God’s glory not in a cloud but was worthy of carrying him in her virginal womb, had relations with a man. Noah, who was made worthy to converse with God, declared that he would abstain from the conjugal need. Moses, after hearing God calling him from the bush, abstained from conjugal relations. Now are we to believe that Joseph, the man who always did what was right, had relations with holy Mary after the birth of the Lord? Tractate on Matthew