The interpretation timeline
Genesis 37:26 Douay-Rheims

And Juda said to his brethren: What will it profit us to kill our brother, and conceal his blood?

A.D. 99 – 1871 5 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

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
מה בצע means WHAT PROFIT— just as the Targum renders it. וכסינו את דמו AND CONCEAL HIS BLOOD — this signifies and we hide the fact of his death (for they had not shed his blood, but had cast him into a pit to die).”
1270
A.D.
Ramban Jewish
1194–1270
“AND WE SHALL CONCEAL HIS BLOOD. “We shall hide the fact of his death.” This is Rashi’s language. And Onkelos similarly says, “and we shall cover up his blood.” The correct interpretation is as its literal sense indicates. It is the custom of those who kill in secret to slay the victim, bury him, and conceal his blood in the earth, even as it says, And he hid him in the sand. This was why Judah said to them, “By casting him into the pit we shall kill our brother and cover his blood with dust, for it will so be accounted to us.” Now Reuben had instructed them not to spill blood with their hands. Rather, they should throw him into the pit and let him perish there, since the punishment of he who causes bloodshed is not the same as the punishment of one who actually commits the murder. Judah now came and said, “This too will be accounted to us as murder, as if we had killed him.” Such indeed is the truth, as the verse says, And him [Uriah] thou hast slain with the sword of the children of Ammon. The difference between actual murder and causing death is that there is a greater punishment for a murderer and a lesser punishment for the one who indirectly causes death. Thus, the two of them [Reuben and Judah] spoke the truth.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Come, and let us sell him to the Ishmaelites,.... For a slave, and that will defeat his dream; and as these were going down to Egypt, where they would sell him, he would be far enough from them, and there would be no probability of his ever being lord over them: and let not our hand be upon him; to take away his life, either by stabbing or starving him: for he is our brother, and our flesh; they had all one father, though different mothers, and therefore, as the relation was so near, some sympathy and compassion should be shown; some degree of tenderness at least, and not savageness and cruelty: and his brethren were content; they agreed to the motion, inasmuch as they supposed it would answer their end as well, which was to prevent his dominion over them.”
Source
1871
A.D.
1871
“Judah said, . . . What profit is it if we slay our brother?--The sight of these travelling merchants gave a sudden turn to the views of the conspirators; for having no wish to commit a greater degree of crime than was necessary for the accomplishment of their end, they readily approved of Judah's suggestion to dispose of their obnoxious brother as a slave. The proposal, of course, was founded on their knowledge that the Arabian merchants trafficked in slaves; and there is the clearest evidence furnished by the monuments of Egypt that the traders who were in the habit of bringing slaves from the countries through which they passed, found a ready market in the cities of the Nile. they . . . lifted up Joseph out of the pit, and sold him--Acting impulsively on Judah's advice, they had their poor victim ready by the time the merchants reached them; and money being no part of their object, they sold him for twenty pieces of silver--The money was probably in rings or pieces (shekels), and silver is always mentioned in the records of that early age before gold, on account of its rarity. The whole sum, if in shekel weight, did not exceed £3. they brought Joseph into Egypt--There were two routes to Egypt: the one was overland by Hebron, where Jacob dwelt, and by taking which, the fate of his hapless son would likely have reached the paternal ears; the other was directly westward across the country from Dothan to the maritime coast, and in this, the safest and most expeditious way, the merchants carried Joseph to Egypt. Thus did an overruling Providence lead this murderous conclave of brothers, as well as the slave merchants both following their own free courses--to be parties in an act by which He was to work out, in a marvellous manner, the great purposes of His wisdom and goodness towards His ancient Church and people.”
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.