The interpretation timeline
Luke 21:1 Douay-Rheims

And looking on, he saw the rich men cast their gifts into the treasury.

A.D. 407 – 1832 7 witnesses 8 excerpts

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“(Hom. 1. in Ep. ad Heb., Hom. 28.) For God regarded not the scantiness of the offering, but the overflowing of the affection. Almsgiving is not the bestowing a few things out of many, but it is that of the widow emptying, herself of her whole substance. But if you cannot offer as much as the widow, at least give all that remains over.”
Source
444
A.D.
A.D. 376–444
“She offered two oboli, which with the sweat of her brow she had earned for her daily living, or what she daily begs for at the hands of others she gives to God, shewing that her poverty is fruitful to her. Therefore does she surpass the others, and by a just award receives a crown from God; as it follows, Of a truth I say unto you, that this poor widow hath cast in more, &c.”
Source
735
A.D.
Bede the Venerable Patristic
c. A.D. 672–735
“For whatever we offer with an honest heart is well pleasing to God, who hath respect unto the heart, not the substance, nor does He weigh the amount of that which is given in sacrifice, but of that from which it is taken; as it follows, For all these have cast in of their abundance, but she all that she had.”
“Now mystically, the rich men who cast their gifts into the treasury signify the Jews puffed up with the righteousness of the law; the poor widow, the simplicity of the Church which is called poor, because it has either cast away the spirit of pride, or its sins, as if they were worldly riches. But the Church is a widow, because her Husband endured death for her. She cast two mites into the treasury, because in God’s sight, in whose keeping are all the offerings of our works, she presents her gifts, whether of love to God and her neighbour, or of faith and prayer. And these excel all the works of the proud Jews, for they of their abundance cast into the offerings of God, in that they presume on their righteousness, but the Church casts in all her living, for every thing that hath life she believes to be the gift of God.”
Source

Scholastic

c. 1100 – 1500
1107
A.D.
c. 1055–1107
“Or the widow may be taken to mean any soul bereft as it were of her first husband, the ancient law, and not worthy to be united to the Word of God. Who brings to God instead of a dowry faith and a good conscience, and so seems to offer more than those who are rich in words, and abound in the moral virtues of the Gentiles.”
Source

Post-Reformation

c. 1650 – 1900
1714
A.D.
Matthew Henry Reformed
1662–1714
“This short passage of story we had before in Mark. It is thus recorded twice, to teach us, 1. That charity to the poor is a main matter in religion. Our Lord Jesus took all occasions to commend it and recommend it. He had just mentioned the barbarity of the scribes, who devoured poor widows (ch. 20); and perhaps this is designed as an aggravation of it, that the poor widows were the best benefactors to the public funds, of which the scribes had the disposal. 2. That Jesus Christ has his eye upon us, to observe what we give to the poor, and what we contribute to works of piety and charity. Christ, though intent upon his preaching, looked up, to see what gifts were cast into the treasury, Luk 21:1. He observes whether we give largely and liberally, in proportion to what we have, or whether we be sneaking and paltry in it; nay, his eye goes further, he observes whether we give charitably and with a willing mind, or grudgingly and with reluctance. This should make us afraid of coming short of our duty in this matter; men may be deceived with excuses which Christ knows to be frivolous. And this should encourage us to be abundant in it, without desiring that men should know it; it is enough that Christ does; he sees in secret, and will reward openly. 3. That Christ observes and accepts the charity of the poor in a particular manner. Those that have nothing to give may yet do a great deal in charity by ministering to the poor, and helping them, and begging for them, that cannot help themselves, or beg for themselves. But here was one that was herself poor and yet gave what little she had to the treasury. It was but two mites, which make a farthing; but Christ magnified it as a piece of charity exceeding all the rest: She has cast in more than they all. Christ does not blame her for indiscretion, in giving what she wanted herself, nor for vanity in giving among the rich to the treasury; but commended her liberality, and her willingness to part with what little she had for the glory of God, which proceeded from a belief of and dependence upon God's providence to take care of her. Jehovah-jireh - the Lord will provide. 4. That, whatever may be called the offerings of God, we ought to have a respect for, and to our power, yea, and beyond our power, to contribute cheerfully to. These have cast in unto the offerings of God. What is given to the support of the ministry and the gospel, to the spreading and propagating of religion, the education of youth, the release of prisoners, the relief of widows and strangers, and the maintenance of poor families, is given to the offerings of God, and it shall be so accepted and recompensed.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“The rich men casting their gifts into the treasury - See all this, from Luk 21:1-4, explained on Mar 12:41-44 (note).”

Undated

date unknown
date
unknown
Glossa Ordinaria Medieval
“(non occ.) Our Lord having rebuked the covetousness of the Scribes who devoured widows’ houses, commends the almsgiving of a widow; as it is said, And he looked up, and saw the rich men casting into the treasury, & c.”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.