John Chrysostom

Thrusting themselves also into the possessions of widows, they grind down their poverty, not content to eat as it may be afforded them, but greedily devouring; using prayer also to an evil end, they thus expose themselves to a heavier condemnation; as it follows, These shall receive the greater damnation.

Catena Aurea by Aquinas ↗

Theophylact of Ohrid

"They devour," He says, "the houses of widows," filling their bellies and squandering beyond what is proper. And the pretext for this is seemingly pious. For, under the pretense of prayer and spiritual benefit, they teach not fasting, but drunkenness and gluttony, and for this, He says, "they will receive the greater condemnation," because they not only do evil, but also cloak it with prayer. Their appearance is pious, yet they make virtue a pretext for wickedness. …

Commentary on Luke ↗

Bede

Those who devour the houses of widows, while feigning long prayers, will receive greater damnation. He did not simply say they will receive damnation, but added greater, to indicate that even those who stand praying in corners to be seen by men (Matthew VI) deserve damnation; but those who do these things more lengthily, as if acting more religiously, not only seeking praises from men but also money, will be punished with lengthier damnation. …

On the Gospel of Luke ↗

Bonaventure

Third, with respect to the appetite for riches, he adds: Who devour the houses of widows, and this through cupidity, whose voracity is never satisfied, and especially when carnality is joined to it. Therefore he says: Who devour the houses of widows, simultaneously implying the voracity of cupidity toward the house and of carnality toward the sex; and concerning these two, Proverbs thirty: "The horseleech has two daughters, crying: Give, give"; and immediately he adds: "Three things are insatiable, and a fourth that never says: …

Commentary on Luke, Chapter 20 ↗