Theophylact of Ohrid

But the rich man says: "No, father!" For just as he himself, hearing the Scriptures, did not believe and considered their words to be fables, so he supposed the same about his brothers, and judging by himself, says that they will not listen to the Scriptures, just as he himself did not, but if someone rises from the dead, they will believe.

Commentary on Luke ↗

Gregory the Dialogist

Hence the rich man also replied: "No, my father; but if someone from the dead goes to them, they will believe." To whom a truthful judgment is immediately spoken: "If they do not hear Moses and the prophets, neither will they believe someone who has risen from the dead," because indeed those who despise the words of the law will fulfill the precepts of the Redeemer, who rose from the dead, with greater difficulty the more subtle they are.

Forty Gospel Homilies, Homily 40 ↗

Bede

"No, father Abraham, but if one goes to them from the dead, they will repent." To whom it was immediately answered with a true sentence:

On the Gospel of Luke ↗

Bonaventure

Thirdly, as to the reason for the petition proposed, he adds: But he said: No, father Abraham, but if someone from the dead goes to them, they will repent. In this he was showing the carnality of his brothers, inasmuch as they would be moved more by a bodily resurrection than by a spiritual revelation. …

Commentary on Luke, Chapter 16 ↗