The interpretation timeline
Genesis 37:28 Douay-Rheims

And when the Madianite merchants passed by, they drew him out of the pit, and sold him to the Ismaelites, for twenty pieces of silver: and they led him into Egypt.

A.D. 99 – 1849 7 witnesses

Patristic

before A.D. 750
99
A.D.
Clement of Rome Patristic
d. A.D. 99
“Every kind of honour and happiness was bestowed upon you, and then was fulfilled that which is written, "My beloved ate and drank, and was enlarged and became fat, and kicked." [Deuteronomy 32:15] Hence flowed emulation and envy, strife and sedition, persecution and disorder, war and captivity. So the worthless rose up against the honoured, those of no reputation against such as were renowned, the foolish against the wise, the young against those advanced in years. For this reason righteousness and peace are now far departed from you, inasmuch as every one abandons the fear of God, and has become blind in His faith, neither walks in the ordinances of His appointment, nor acts a part becoming a Christian, but walks after his own wicked lusts, resuming the practice of an unrighteous and ungodly envy, by which death itself entered into the world. [Wisdom 2:24] For thus it is written: "And it came to pass after certain days, that Cain brought of the fruits of the earth a sacrifice unto God; and Abel also brought of the firstlings of his sheep, and of the fat thereof. And God had respect to Abel and to his offerings, but Cain and his sacrifices He did not regard. And Cain was deeply grieved, and his countenance fell. And God said to Cain, Why are you grieved, and why is your countenance fallen? If you offer rightly, but do not divide rightly, have you not sinned? Be at peace: your offering returns to yourself, and you shall again possess it. And Cain said to Abel his brother, Let us go into the field. And it came to pass, while they were in the field, that Cain rose up against Abel his brother, and slew him." [Genesis 4:3-8] You see, brethren, how envy and jealousy led to the murder of a brother. Through envy, also, our father Jacob fled from the face of Esau his brother [Genesis 27:41-45]. Envy made Joseph be persecuted unto death, and to come into bondage. [Genesis 37:18-28] Envy compelled Moses to flee from the face of Pharaoh king of Egypt, when he heard these words from his fellow-countryman, "Who made you a judge or a ruler over us? Will you kill me, as you killed the Egyptian yesterday?" [Exodus 2:14] On account of envy, Aaron and Miriam had to make their abode without the camp. [Numbers 12:14-15] Envy brought down Dathan and Abiram alive to Hades, through the sedition which they excited against God's servant Moses. [Numbers 16:33] Through envy, David not only underwent the hatred of foreigners, but was also persecuted by Saul king of Israel. [1 Samuel 21:10-15]”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“What an unlawful contract! What baleful profit! What illicit sale! The one who caused the same birth pangs as yourselves, the one so dear to your father, the one who came to see you, who never did you the slightest wrong, you endeavored to sell—and sell to savage people traveling down to Egypt.What unlawful frenzy! What dreadful malice! I mean, even if you did this out of fear of the dreams, convinced that they would certainly come to pass in every detail, why did you attempt the impossible and give evidence by what you did of your hostility toward God, who had foretold this to Joseph? If, on the contrary, you give no credence to the dreams but consider them nonsense, why did you do what brought you everlasting defilement and caused your father irreparable grief? But what excess of passion—or rather, of a bloodthirsty intention! You see, when someone is obsessed with some improper exploit and becomes intoxicated with improper designs, he does not keep before him the unsleeping eye; he has no respect even for nature or anything else that could bring him to compassion. That was the situation with these men too. They were not concerned that he was their brother, that he was only a youth, that he was so dear to their father, that he had no experience of life in foreign parts or living in exile and yet was on the point of departing for such a land and living among savages. Instead, they abandoned every sane consideration and had one thing on their minds, allowing their envy to have (as they thought) an immediate effect.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
ויעברו אנשים מדינים AND THERE PASSED BY MIDIANITES — This was another caravan: Scripture indicates that he was sold several times. וימשכו AND THEY DREW UP — the sons of Jacob drew up את יוסף מן הבור JOSEPH FROM THE PIT, and they sold him to the Ishmaelites, and the Ishmaelites to the Midianites and the Midianites into Egypt (Midrash Tanchuma 1:9:13).”
Source
1167
A.D.
Ibn Ezra Jewish
1089–1167
“When the Ishmaelite merchants passed by them, because the Midianites are called Ishmaelites. And so it says about the kings of Midian, that they were Ishmaelites (Shoftim 8:24).”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And Reuben returned unto the pit,.... It is very probable he had pretended to go somewhere on business, with an intention to take a circuit, and come to the pit and deliver his brother, and go home with him to his father. The Jews say (b) he departed from his brethren, and sat down on a certain mountain, that he might descend in the night and take Joseph out of the pit, and accordingly he came down in the night, and found him not. So Josephus (c) says, it was in the night when Reuben came to the pit, who calling to Joseph, and he not answering, suspected he was killed: and, behold, Joseph was not in the pit; for neither by looking down into it could he see him, nor by calling be answered by him, which made it a clear case to him he was not there: and he rent his clothes; as a token of distress and anguish of mind, of sorrow and mourning, as was usual in such cases; Jacob afterwards did the same, Gen 37:34. (b) Pirke Eliezer, ut supra. (c. 38.) (c) Antiqu. l. 2. c. 3. sect. 3.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“For twenty pieces of silver - In the Anglo-Saxon it is thirty pence. This, I think, is the first instance on record of selling a man for a slave; but the practice certainly did not commence now, it had doubtless been in use long before. Instead of pieces, which our translators supply, the Persian has miskal, which was probably intended to signify a shekel; and if shekels be intended, taking them at three shillings each, Joseph was sold for about three pounds sterling. I have known a whole cargo of slaves, amounting to eight hundred and thirteen, bought by a slave captain in Bonny river, in Africa, on an average, for six pounds each; and this payment was made in guns, gunpowder, and trinkets! As there were only nine of the brethren present, and they sold Joseph for twenty shekels, each had more than two shekels as his share in this most infamous transaction.”
Source
1849
A.D.
1774–1849
“Of silver. Some have read, thirty pieces of gold or silver. (St. Ambrose, c. 3.) — The price was trifling: twenty sicles would be about £2 5s. 7½d. English. The Madianites and Ismaelites jointly purchased Joseph. (Haydock)”
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.