Augustine of Hippo

Or because out of the hundred measures of oil, he caused fifty to be written down by the debtors, and of the hundred measures of wheat, fourscore, the meaning thereof is this, that those things which every Jew performs toward the Priests and Levites should be the more abundant in the Church of Christ, that whereas they give a tenth, Christians should give a half, as Zaccheus gave of his goods, (Luke 19:8.) or at least by giving two tenths, that is, a fifth, exceed the payments of the Jews.

Catena Aurea by Aquinas ↗

Bede

A cadus in Greek is a vessel containing three urns. It follows, And he said unto him, Take thy bill, and sit down quickly, and write fifty, forgiving him the half. It follows, Then said he to another, And how much owest thou? And he said, An hundred measures of wheat. A corus is made up of thirty bushels. And he said unto him, Take thy bill, and write fourscore, forgiving him a fifth part. …

Catena Aurea by Aquinas ↗

Bonaventure

And he said to him: A hundred measures of oil, through faithful acknowledgment of the debt. For each person ought faithfully to acknowledge his own debt, lest perchance that word of Revelation three be said to him: "You say: I am rich and made wealthy and have need of nothing; and you know not that you are wretched and miserable and poor and blind and naked." Now the cadus is a measure containing three urns; whence the Gloss: "Cadus in Greek, amphora in Latin, containing three urns." In this, moreover, is intimated the magnitude of …

Commentary on Luke, Chapter 16 ↗