The interpretation timeline
Genesis 37:20 Douay-Rheims

Come, let us kill him, and cast him into some old pit: and we will say: Some evil beast hath devoured him: and then it shall appear what his dreams avail him:

A.D. 99 – 1849 6 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
ונראה מה יהיו חלמתיו AND WE SHALL SEE WHAT WILL BECOME OF HIS DREAMS — R. Isaac said, this verse calls for a homiletic explanation. The Holy Spirit said this latter part of the text. They say “let us slay him”, and Scripture (i.e. the Holy Spirit) breaks in upon their words concluding them by saying, “and we shall see what will become of his dreams”: we shall see whose words will be fulfilled — yours or mine. For it is impossible that they should have said, “and we shall see what will become of his dreams”, for as soon as they would kill him his dreams would be of no effect (Tanchuma Yashan 1:9:13).”
Source
1270
A.D.
Ramban Jewish
1194–1270
“AND WE SHALL SEE WHAT WILL BECOME OF HIS DREAMS. This is a derisive metaphor: “We shall see after his death if we shall prostrate ourselves before him.” The correct interpretation appears to me to be that they said, “Now we shall see what will become of his dreams, for if he shall be rescued from our hands he will surely reign over us.” But our Rabbis said: “It is the Ruach Hakodesh, Note 90. that says, We shall see what will become of his dreams, which completes the sentence, and not Joseph’s brothers. as if to say; ‘We shall see whose words shall stand, Mine or theirs.’””
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And Reuben heard it,.... Overheard what they said, not being in the consultation; perhaps knowing his temper and disposition to be more mild and gentle, and being the elder brother, might fear he would overrule matters against them, and therefore Simeon and Levi did not choose to have him in the debate; or he might be at some distance and entirely absent when the consultation was held, and their intention was reported to him by some of them: and he delivered him out of their hands; from slaying him; that is, he endeavoured to do it by proposing another scheme: and said, let us not kill him; or let us not smite the soul (t); the dear soul, or take away life. (t) "ne percutiamus vel occidamus animam", Sam. Ar. Syr.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Come now and let us slay him - What unprincipled savages these must have been to talk thus coolly about imbruing their hands in an innocent brother's blood! How necessary is a Divine revelation, to show man what God hates and what he loves! Ferocious cruelty is the principal characteristic of the nations and tribes who receive not the law at his mouth.”
Source
1849
A.D.
1774–1849
“Pit: walled around to contain water: Hebrew Bur. Bar means a well that has no walls. (Menochius) — Shall appear. They resolve to tell a lie, and easily believe that Joseph had been as bad as themselves in telling one first. If they had believed the dreams were from God, they would hardly have supposed that they could prevent them from having their effect. (Haydock)”
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.