The interpretation timeline
2 Samuel 12:3 Douay-Rheims

But the poor man had nothing at all but one little ewe lamb, which he had bought and nourished up, and which had grown up in his house together with his children, eating of his bread, and drinking of his cup, and sleeping in his bosom: and it was unto him as a daughter.

A.D. 407 – 1849 6 witnesses 7 excerpts

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Therefore, Nathan went to David and wove a dramatic act for judgment. And what did he say? "My king, I want your judgment. There was a certain rich man and a certain poor one. The rich person possessed herds of cattle and many other flocks; and the poor one had one ewe that drank from his glass, ate from his table and slept in his embrace." Here Nathan revealed the genuine bond between a husband and wife. "When a certain stranger arrived, the rich man desired to keep his own animals, and he took the poor man's ewe and slaughtered her." Here, do you see how Nathan wove the dramatic act, mysteriously concealing the weapon in the glands of David's throat? Then what did the king say? Thinking that he had to pass judgment against someone else, he decided most severely. For such are human beings. When it concerns other people, they gladly and abruptly render decisions and publicize them. And what did David say? "As the Lord lives, the man who did this thing is worthy of death. And he shall restore the lamb fourfold." Therefore, what did Nathan reply? He did not allow the wound to be relieved for many hours; rather, he quickly stripped it naked and sharply embedded the knife deeply into it, so as not to rob it of the painful sensation. "You are the man, my king." What did the king say? "I have sinned against the Lord." He did not say, "Who are you who censures me? Who sent you to speak with such boldness? With what daring did you prevail?" He did not say anything of the sort; rather, he perceived the sin. And what did he say? "I have sinned against the Lord." Therefore, what did Nathan say to him? "And the Lord remitted your sin." You condemned yourself; I [God] remit your sentence. You confessed prudently; you annulled the sin. You appropriated a condemnatory decision against yourself; I repealed the sentence. Can you see that what is written in Scripture was fulfilled: "Be the first one to tell of your transgression so you may be justified" How toilsome is it to be the first one to declare the sin?”
Source
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“And with what moderation and self-restraint those men used their wives appears chiefly in this, that when this same king, carried away by the heat of passion and by temporal prosperity, had taken unlawful possession of one woman, whose husband also he ordered to be put to death, he was accused of his crime by a prophet, who, when he had come to show him his sin, set before him the parable of the poor man who had but one ewe lamb, and whose neighbor, though he had many, yet when a guest came to him, refused to take of his own flock but set his poor neighbor's one lamb before his guest to eat. And David's anger being kindled against the man, he commanded that he should be put to death and the lamb restored fourfold to the poor man; thus unwittingly condemning the sin he had wittingly committed. And when he had been shown this, and God's punishment had been announced against him, he wiped out his sin in deep penitence. But yet in this parable it was the adultery only that was indicated by the poor man's ewe lamb. About the killing of the woman's husband—that is, about the murder of the poor man himself who had the one ewe lamb—nothing is said in the parable, so that the sentence of condemnation is pronounced against the adultery alone. And hence we may understand with what temperance he possessed a number of wives when he was forced to punish himself for transgressing in regard to one woman. But in his case the immoderate desire did not take up its abode with him but was only a passing guest. On this account the unlawful appetite is called even by the accusing prophet, a guest. For he did not say that he took the poor man's ewe lamb to make a feast for his king, but for his guest. In the case of his son Solomon, however, this lust did not come and pass away like a guest but reigned as a king. And about him Scripture is not silent but accuses him of being a lover of strange women; for in the beginning of his reign he was inflamed with a desire for wisdom, but after he had attained it through spiritual love, he lost it through carnal lust.”
Source
“For I admit my wrongdoing, and my offense confronts me all the time. "I have not thrust my deed behind my back; I do not look askance at others while forgetting myself; I do not presume to extract a speck of straw from my brother's eye while there is a timber in my own; my sin is in front of me, not behind my back. It was behind me until the prophet was sent to me and put to me the parable of the poor man's sheep." What the prophet Nathan said to David was this: There was a certain rich man who had a large flock of sheep. His neighbor was a poor man who had only one little ewe lamb; she rested in his arms and was fed from his own dish. Then a guest arrived at the rich man's house. The rich man took nothing from his flock; what he wanted was the little ewe lamb that belonged to his neighbor, so he slaughtered that for his guest. What does he deserve? Angrily David pronounced sentence. Obviously the king was unaware of the trap into which he had fallen, and he decreed that the rich man deserved to die and must make fourfold restitution for the sheep. It was a very severe view, and entirely just. But his own sin was not yet before his eyes; what he had done was still behind his back. He did not yet admit his own iniquity and hence would not remit another's. But the prophet had been sent to him for this purpose. He brought the sin out from behind David's back and held it before his eyes, so that he might see that the severe sentence had been passed on himself. To cut away diseased tissue in David's heart and heal the wound there, Nathan used David's tongue as a knife.”
Source
604
A.D.
Gregory the Great Patristic
c. A.D. 540–604
“But sometimes, when the powerful of this world are taken to task, they are first to be searched by certain similitudes, as on a matter not concerning them; and, when they have pronounced a right sentence as against another man, then in fitting ways they are to be smitten with regard to their own guilt; so that the mind puffed up with temporal power may in no wise lift itself up against the reprover, having by its own judgment trodden on the neck of pride, and may not try to defend itself, being bound by the sentence of its own mouth. For hence it was that Nathan the prophet, having come to take the king to task, asked his judgment as if concerning the cause of a poor man against a rich one, that the king might first pronounce sentence, and afterwards hear of his own guilt, to the end that he might by no means contradict the righteous doom that he had uttered against himself. Thus the holy man, considering both the sinner and the king, studied in a wonderful order first to bind the daring culprit by confession, and afterwards to cut him to the heart by rebuke. He concealed for a while whom he aimed at, but smote him suddenly when he had him. For the blow would perchance have fallen with less force had he purposed to smite the sin openly from the beginning of his discourse; but by first introducing the similitude he sharpened the rebuke which he concealed. He had come as a physician to a sick man; he saw that the sore must be cut; but he doubted of the sick man's patience. Therefore he hid the medicinal steel under his robe, which he suddenly drew out and plunged into the sore, that the patient might feel the cutting blade before he saw it, lest, seeing it first, he should refuse to feel it.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And there came a traveller unto the rich man,.... By which some understand Satan, who came to David, and stirred up his lust by the temptations that offered; who is a walker, as the word used signifies, that goes about seeking whom he may devour, and is with good men only as a wayfaring man, who does not abide with them; and whose temptations, when they succeed with such, are as meat and drink to him, very entertaining but the Jews generally understand it of the evil imagination or concupiscence in man, the lustful appetite in David, that wandered after another man's wife, and wanted to be satiated with her: and he spared to take of his own flock, and of his own herd, to dress for the wayfaring man that came unto him; when his heart was inflamed with lust at the sight of Bathsheba, he did not go as he might, and take one of his wives and concubines, whereby he might have satisfied and repressed his lust: but took the poor man's lamb, and dressed it for the man that came to him; sent for Bathsheba and lay with her, for the gratification of his lust, she being a young beautiful woman, and more agreeable to his lustful appetite. The Jews, in their Talmud (r), observe a gradation in these words that the evil imagination is represented first as a traveller that passes by a man, and lodges not with him; then as a wayfaring man or host, that passes in and lodges with him; and at last as a man, as the master of the house that rules over him, and therefore called the man that came to him. (r) T. Bab. Succah, fol. 52. 2. Jarchi, Kimchi, & Abarbinel in loc.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“And lay in his bosom - This can only mean that this lamb was what we call a pet or favourite in the family, else the circumstance would be very unnatural, and most likely would have prevented David from making the application which he did, as otherwise it would have appeared absurd. It is the only part of this parable which is at variance with nature and fact.”
Source
1849
A.D.
1774–1849
“Daughter. All these expressions tended to shew the affection of the owner for this pet lamb. (Haydock) — In Arabia, one of the finest is commonly fed in the house along with the children. (Bochart, Anim. T. i. B. ii. 46.) — It is not necessary that every word of this parable should have been verified in Bethsabee. (Calmet) — Many things are usually added for ornament. (Menochius)”
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.