Ambrose of Milan

Mystically, this woman is the synagogue, which had seven husbands, as it is said to the Samaritan, Thou hadst five husbands, (John 4:18.) because the Samaritan follows only the five books of Moses, the synagogue for the most part seven. And from none of them has she received the seed of an hereditary offspring, and so can have no part with her husbands in the resurrection, because she perverts the spiritual meaning of the precept into a carnal. …

Catena Aurea by Aquinas ↗

Bede

Therefore, there were seven brothers, and the first took a wife, and died without children. And the second took her, and he too died without children. And the third took her. Similarly, all seven, and they left no seed, and died. Last of all, the woman also died. Those who did not believe in the resurrection of bodies, judging that the soul perishes with the bodies, rightly fabricate such a story, which accuses as madness those who assert the resurrection of the dead. …

On the Gospel of Luke ↗

Bonaventure

Third, regarding the allegation of those introducing the case, it is added: Therefore there were seven brothers, and the first took a wife and died without children. And the next took her, and he himself died without a son. And the third took her. Likewise also all seven, and they did not leave seed and died. Last of all the woman also died. …

Commentary on Luke, Chapter 20 ↗