The interpretation timeline
1 Kings 21:20 Douay-Rheims

And Achab said to Elias: Hast thou found me thy enemy? He said: I have found thee, because thou art sold, to do evil in the sight of the Lord.

1105 – 1875 6 witnesses

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
“You have sold yourself. You sold yourself to anger your Creator, התמכרת [=you have sold yourself], as in, “and there you will attempt to sell yourselves [והתמכרתם] to your enemies.””

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Him that dieth of Ahab in the city the dogs shall eat, and him that dieth in the field the fowls of the air shall eat. That is, they shall have no burial, see Kg1 14:11 hitherto are the words of the Lord by Elijah; next follow the remarks of the historian. hitherto are the words of the Lord by Elijah; next follow the remarks of the historian. 1 Kings 21:25 kg1 21:25 kg1 21:25 kg1 21:25But there was none like unto Ahab, which did sell himself to work wickedness in the sight of the Lord,.... Not of any of his predecessors, even those whose families had been destroyed, as his would be, Kg1 21:21. See Gill on Kg1 21:20. whom Jezebel his wife stirred up; to idolatry, revenge, and murder, and to whose will he was a slave, and is one instance of his being a captive to sin, and giving up himself to the power of it.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Thou hast sold thyself to work evil - See a similar form of speech, Rom 7:14 (note). Thou hast totally abandoned thyself to the service of sin. Satan is become thy absolute master, and thou his undivided slave.”
1849
A.D.
1774–1849
“Thy enemy. Have I done thee any harm, whenever thou hast appeared before me? Hebrew and Septuagint, “O my enemy.” (Haydock) — To find, often means to attack or take by surprise. Art thou come thus, to fall upon me on the road? (Calmet) — Sold. That is, so addicted to evil, as if thou hadst sold thyself to the devil, to be his slave to work all kind of evil. (Challoner) (Worthington) (St. Gregory, in Ezec. hom. 10.) — The expression strongly marks the empire of the passions. Achab was sovereignly wicked, without any restraint. (Calmet) — So Vitellius was: Luxui saginęque mancipatus, emptusque. (Tacitus, Hist. ii.) — Sold, or “abandoned,” are used in the same sense, Psalm xliii. 13.”
Source
1871
A.D.
1871
“thou hast sold thyself to work evil--that is, allowed sin to acquire the unchecked and habitual mastery over thee (Kg2 17:17; Rom 7:11).”
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“Ahab answered, "Hast thou found me (met with me), O mine enemy?" (not, hast thou ever found me thine enemy? - Vulg., Luth.) i.e., dost thou come to meet me again, mine enemy? He calls Elijah his enemy, to take the sting from the prophet's threat as an utterance caused by personal enmity. But Elijah fearlessly replied, "I have found (thee), because thou sellest thyself to do evil in the eyes of the Lord." He then announced to him, in Kg1 21:21, Kg1 21:22, the extermination of his house, and to Jezebel, as the principal sinner, the most ignominious end (Kg1 21:23). הרע לעשׂות חתמכּר to sell one's self to do evil, i.e., to give one's self to evil so as to have no will of one's own, to make one's self the slave of evil (cf. Kg1 21:25, Kg2 17:17). The consequence of this is πεπρᾶσθαι ὑπὸ τὴν ἁμαρτίαν (Rom 7:14), sin exercising unlimited power over the man who gives himself up to it as a slave. For Kg1 21:21, Kg1 21:22, see Kg1 14:10-11; Kg1 15:29-30; Kg1 16:3, Kg1 16:12-13. The threat concerning Jezebel (Kg1 21:23) was literally fulfilled, according to Kg2 9:30. חל, written defectively for חיל, as in Sa2 20:15, is properly the open space by the town-wall, pomoerium. Instead of בּחל we have בּחלק in the repetition of this threat in Kg2 9:10, Kg2 9:36-37, and consequently Thenius and others propose to alter the חל here. But there is no necessity for this, as בּחלק, on the portion, i.e., the town-land, of Jezreel (not, in the field at Jezreel), is only a more general epithet denoting the locality, and חל is proved to be the original word by the lxx.”
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.