John Chrysostom

When alms are given, we attend to nothing else except the disposition required. And if you say that money is needed, and houses and clothes and shoes, read those words of Christ, which he spoke concerning the widow, and stop being anxious. For even if you are extremely poor, and among those that beg, if you cast in your two small coins, you have done all in your power. Though you offer only a barley cake, having only this, you will have arrived at the heart of the matter.

The Gospel Of St Matthew, Homily 52.5 ↗

Augustine of Hippo

But what, brethren, is more mighty than that not only Zacchaeus should acquire the kingdom of heaven by the half of his goods, but even the widow for two pennies, and that each should possess an equal share there? What is greater than that the same kingdom should be worth treasures to the rich man, and a cup of cold water to the poor?

On The Psalms 112.3 ↗

Bede

Again, in an allegorical way, the rich men, who cast gifts into the treasury, point out the Jews puffed up with the righteousness of the law; the poor widow is the simplicity of the Church: poor indeed, because she has cast away the spirit of pride and of the desires of worldly things; and a widow, because Jesus her husband has suffered death for her. …

Catena Aurea by Aquinas ↗

Bonaventure

Again, in Mark 12 the Lord says of the widow: Amen I say to you, that this poor widow has put in more than all. For all cast in of their abundance; but she of her want cast in all that she had, her whole living: but in this the poor widow is praised: therefore those who do this, the more perfectly they act, the more praiseworthy they are: therefore etc.

Disputed Questions on Evangelical Perfection, Question 2 ↗