The interpretation timeline
Genesis 37:21 Douay-Rheims

And Ruben hearing this, endeavoured to deliver him out of their hands, and said:

A.D. 99 – 1875 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
לא נכנו נפש — supply the word מכת so that the meaning will be “Let us not smite him with a smiting of his life” — it means killing.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And Reuben said unto them, shed no blood,.... Innocent blood, as the Targum of Jonathan; the blood of a man, a brother's blood, one that had not done anything wherefore it should be shed, and which would involve in guilt, and bring vengeance on them: he seems to put them in mind of the original law in Gen 9:6, but cast him into this pit that is in the wilderness, and lay no hand upon him: which might seem to answer the same purpose, namely, by depriving him of his life in another way, by starving him; but this was not Reuben's intention, as appears by the next clause, and by his going to the pit afterwards, as it should seem, with a view to take him out of it privately; this advice he gave: that he might rid him out of their hands, to deliver him to his father again; safe and sound, in order, as it is thought by many interpreters, to reconcile his father to him, whose bed he had abused.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Reuben heard it - Though Reuben appears to have been a transgressor of no ordinary magnitude, if we take Gen 35:22 according to the letter, yet his bosom was not the habitation of cruelly. He determined, if possible, to save his brother from death, and deliver him safely to his father, with whose fondness for him he was sufficiently acquainted. Josephus, in his usual way, puts a long flourishing speech in the mouth of Reuben on the occasion, spoken in order to dissuade his brethren from their barbarous purpose; but as it is totally unfounded, it is worthy of no regard.”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“Reuben, who was the eldest son, and therefore specially responsible for his younger brother, opposed this murderous proposal. He dissuaded his brethren from killing Joseph (נפשׁ פ הכּה ), and advised them to throw him "into this pit in the desert," i.e., into a dry pit that was near. As Joseph would inevitably perish even in that pit, their malice was satisfied; but Reuben intended to take Joseph out again, and restore him to his father. As soon, therefore, as Joseph arrived, they took off his coat with sleeves and threw him into the pit, which happened to be dry.”
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.