Deuteronômio 25
Augustine of Hippo · Comentário Patrístico (catena)
Deuteronômio 25:5
In the third book, then, when I was solving the question of how it was possible for Joseph to have two fathers, I indeed said that "he was begotten by one and adopted by the other." But I should have mentioned too the kind of adoption, for what I said sounds as if another living father had adopted him. The law, however, also adopted the children of the deceased by ordering that "a brother marry the wife" of his childless, deceased brother and "raise up seed" by the same woman "for his deceased brother." In this way the explanation of this matter of the two fathers of one man is indeed made clearer. — RECONSIDERATIONS 2.33.2
Deuteronômio 25:9
The role of holy women was different in the times of the prophets. Obedience, not concupiscence, impelled women to marry for the propagation of the people of God, among whom the forerunners of Christ were sent in advance. For this people, by the things that happened to them as a type, whether they recognized these types or not, were indeed prophetic of Christ, from whom Christ was to take flesh. Hence, in order that this race might be multiplied, the man who did not raise up seed in Israel was held accursed by sentence of the law. That is why holy women were animated by the pious desire of offspring rather than by desire. We may rightly believe that they would not have sought the marriage union if children could have been obtained in any other way. — ON THE GOOD OF WIDOWHOOD 6.10