The interpretation timeline
Genesis 23:20 Douay-Rheims

And the field was made sure to Abraham, and the cave that was in it, for a possession to bury in, by the children of Heth.

A.D. 407 – 1875 3 witnesses 4 excerpts

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“With this in mind, dearly beloved, let us who live in the age of grace imitate the man who lived before the law, not burn with desire for more and heap up for ourselves to a greater and more intense degree the fire that cannot be extinguished and the flame that is intolerable. We will hear, in fact, if we persist in such awful deeds of injustice and avarice, the words spoken to that notorious rich man, "Fool, this night they are looking for your soul from you; but as for what you have put aside, whom will it belong to?" I mean, what is the reason, dearly beloved, that you are anxious to amass so many things that you will shortly leave here, due as you are to be snatched away from the scene, not only powerless to gain any advantage from them but even saddled with the burden of sins on your own shoulders, at this stage too late for worthwhile repentance? While the goods you have amassed with avarice oftentimes finish even in the hands of enemies, you yourself will be required to give an account of them. So what folly would it be to labor for others' benefit and pay the price for them yourself?”
Source
“Even if in the past, however, we have to this degree managed our affairs with indifference, now at least let us plan for what is needful and not simply be anxious to bedeck ourselves with the trappings of wealth, but rather pay much attention to doing good. After all, our being will not come to an end with this present life, nor shall we be always in exile; instead, before long we shall reach our true homeland. So let us do everything in the hope of not being found wanting there. I mean, what good is it to leave behind great wealth in foreign parts while wanting for bare necessities in our true country? Consequently let us strive, dearly beloved, while there is still time, to transfer there what we own in this foreign country. Although in fact the distance may be great, nevertheless the transfer is quite easy. You see, there are those ready to make the transfer, to travel there safely and deposit in a secure treasury whatever we are able to send ahead by means of them. I mean, the hands of the poor lay up in the treasuries of heaven what is given them by us. Since then the ease and security are so great, why do we delay and not rather with all haste act on this so that we will have those things at our disposal in the place where we most have need of them?”
Source

Post-Reformation

c. 1650 – 1900
1832
A.D.
Adam Clarke Methodist
1762–1832
“And the field, etc. were made sure - ויקם vaiyakom, were established, caused to stand; the whole transaction having been regulated according to all the forms of law then in use. 1. In this transaction between Abraham and the sons of Heth concerning the cave and field of Machpelah, we have the earliest account on record of the purchase of land. The simplicity, openness, and candour on both sides cannot be too much admired. 2. Sarah being dead, Abraham being only a sojourner in that land, shifting from place to place for the mere purpose of pasturing his flocks, and having no right to any part of the land, wished to purchase a place in which he might have the continual right of sepulture. For this purpose, 1. He goes to the gate of the city, the place where, in all ancient times, justice was administered, and bargains and sales concluded, and where for these purposes the elders of the people sat. 2. He there proposes to buy the cave known by the name of the Cave of Machpelah, the cave of the turning or the double cave, for a burying place for his family. 3. To prevent him from going to any unnecessary expense, the people with one voice offer him the privilege of burying his wife in any of their sepulchers; this appearing to them to be no more than the common rights of hospitality and humanity required. 4. Abraham, intent on making a purchase, Ephron, the owner of the field and cave, values them at four hundred shekels, but at the same time wishes Abraham to receive the whole as a gift. 5. Abraham refuses the gift and weighs down the silver specified. 6. The people who enter in at the gate, i.e., the inhabitants coming from or going to their ordinary occupations in the country, witness the transaction, and thus the conveyance to Abraham is made sure without the intervention of those puzzlers of civil affairs by whose tricks and chicanery property often becomes insecure, and right and succession precarious and uncertain. But this censure does not fall on lawyers properly so called, who are men of honor, and whose office, in every well-regulated state, is as useful as it is respectable. But the accumulation and complex nature of almost all modern systems of law puzzle even justice herself, and often induce decisions by which truth falls in the streets and equity goes backwards. In the first ages of mankind, suspicion, deceit, and guile seem to have had a very limited influence. Happy days of primitive simplicity! When shall they return? 3. We often hear of the rudeness and barbarity of the primitive ages, but on what evidence? Every rule of politeness that could be acted upon in such a case as that mentioned here, is brought into full practice. Is it possible to read the simple narration in this place without admiring the amiable, decent, and polite conduct displayed on both sides? Had even Lord Chesterfield read this account, his good sense would have led him to propose it as a model in all transactions between man and his fellows. There is neither awkward, stiff formality on the one hand, nor frippery or affectation on the other. Decent respect, good sense, good nature, and good breeding, are all prominently displayed. And how highly laudable and useful is all this! A pedant or a boor on either side might have destroyed the simplicity of the whole transaction; the one by engendering caution and suspicion, and the other by exciting disgust. In all such transactions the beau and the boor are equally to be avoided. From the first no sincerity can be expected, and the manners of the latter render him intolerable. The religion of the Bible recommends and inculcates orderly behavior, as well as purity of heart and life. They who, under the sanction of religion, trample under foot the decent forms of civil respect, supposing that because they are religious they have a right to be rude, totally mistake the spirit of Christianity, for love or charity (the soul and essence of that religion) behaveth not itself unseemly. Every attentive reader of the thirteenth chapter of St. Paul's first epistle to the Corinthians, will clearly discern that the description of true religion given in that place applies as forcibly to good breeding as to inward and outward holiness. What lessons of honesty, decent respect, and good manners could a sensible man derive from Abraham treating with the sons of Heth for the cave of Machpelah, and William Penn treating with the American Indians for the tract of land now called Pennsylvania! I leave others to draw the parallel, and to show how exactly the conduct and spirit of patriarch the first were exemplified in the conduct and spirit of patriarch the second. Let the righteous be had in everlasting remembrance!”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“The repetition of the statement, that the field with the cave in it was conveyed to Abraham by the Hittites for a burial-place, which gives the result of the negotiation that has been described with, so to speak, legal accuracy, shows the great importance of the event to the patriarch. The fact that Abraham purchased a burying-place in strictly legal form as an hereditary possession in the promised land, was a proof of his strong faith in the promises of God and their eventual fulfilment. In this grave Abraham and Sarah, Isaac and Rebekah, were buried; there Jacob buried Leah; and there Jacob himself requested that he might be buried, thus declaring his faith in the promises, even in the hour of his death.”
Source
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.