Theophylact of Ohrid

The Sadducees, basing their speculations on a weak foundation, did not believe in the teaching of the resurrection. Assuming that after the resurrection there would be a bodily life, they naturally fell into error. Therefore, mocking the teaching of the resurrection as absurd, they invented the present senseless story.

Commentary on Luke ↗

Augustine of Hippo

The Sadducees were a particular sect of the Jews that did not believe in the resurrection. When the Sadducees posed this problem, the Jews were uncertain, hesitant and could not really answer it, because they assumed that flesh and blood could possess the kingdom of God, that is, the perishable could possess imperishability. Along comes Truth. The misguided and misguiding Sadducees questioned him and posed that problem to the Lord. …

Sermon 362.18 ↗

Bede

Then some of the Sadducees, who deny that there is a resurrection, came forward. There were two heresies among the Jews, one of the Pharisees and the other of the Sadducees. The Pharisees upheld the justice of traditions and observations, which they call deuterosis. Hence they were called divided by the people. The Sadducees, however, who are interpreted as just, claimed for themselves what they were not. …

On the Gospel of Luke ↗

Bonaventure

But certain ones came forward. After he confuted the faithlessness of those erring from malice, here secondly he confutes the unbelief of those erring from ignorance; and this part has two sections. In the first he confutes the error concerning the resurrection; in the second, concerning the incarnation, at the place: But he said to them. …

Commentary on Luke, Chapter 20 ↗