1 Corinthians 5:8 calls for purging the old leaven of malice — directly applying the principle to the sin introduced in verse 1.

In 1 Corinthians 6:18, Paul commands fleeing sexual immorality as a unique sin against one's own body, directly applying to the incest case.

In 1 Corinthians 6:13, Paul grounds the prohibition of sexual immorality in the body's purpose for the Lord, giving theological depth to the case in 5:1.

In 1 Corinthians 6:9, Paul lists the sexually immoral among those excluded from God's kingdom—underscoring the severity of the sin in 5:1.

In 1 Corinthians 11:18, Paul similarly reports hearing of divisions — both verses begin with reports of sin in the church.

Genesis 49:4 repeats Reuben's defiling his father's bed—a direct parallel to the incest in 1 Corinthians 5:1.

In 2 Corinthians 12:21, Paul fears unrepented sexual immorality among them, showing the issue persists after the first letter.

2 Corinthians 7:12 refers back to the same Corinthian incident, showing Paul's motivation in writing about the offender.

Genesis 35:22 records Reuben lying with his father's concubine—the exact same sin as the man in Corinth.

Ezekiel 22:10 condemns uncovering a father's nakedness, directly mirroring the incestuous sin in Corinth.

Leviticus 18:8 forbids uncovering your father's wife's nakedness—the law that the Corinthian sin violates.

1 Chronicles 5:1 notes Reuben's incest with his father's concubine, another OT case of the same sin Paul addresses.

2 Samuel 16:22 records Absalom sleeping with David's concubines, a historical example of a son taking his father's wives.

Leviticus 20:11 prescribes death for lying with your father's wife—showing the severe judgment this sin deserves.

Deuteronomy 22:30 prohibits a man taking his father's wife—another direct legal parallel to the sin in Corinth.

Deuteronomy 27:20 curses lying with a father's wife, directly paralleling the incest Paul condemns in Corinth.

In Jeremiah 18:13, God asks nations if they have heard of such a horrible thing — same rhetorical pattern as Paul's 'not even among pagans'.

In 2 Cor 2:5, Paul refers back to the same offender who caused grief, showing the disciplinary action's aftermath.

2 Corinthians 2:3 refers back to Paul's previous letter (1 Corinthians) about the disciplinary case — same situation.

In 2 Samuel 16:21, Ahithophel advises Absalom to take his father's concubines — a parallel case of a son having his father's wife.

Ezekiel 5:6 condemns Israel for being worse than the nations — mirrors Paul's claim that Corinth's sin exceeds pagan morality.

Jeremiah 2:10 asks nations if such a thing has ever happened — echoing Paul's point that even pagans don't commit this sin.

In 1 Samuel 2:24, Eli hears a bad report about his sons' sexual immorality—mirroring the report of incest in Corinth.

In Ephesians 5:3, Paul forbids even naming sexual immorality among saints, echoing the standard applied to the incestuous man.

In 1 Thessalonians 4:7, God calls believers to holiness not impurity, reinforcing the divine standard violated in 5:1.

In Acts 15:20, the Jerusalem council includes sexual immorality among essential prohibitions for Gentiles, showing its early church prominence.

In Colossians 3:5, Paul commands putting to death sexual immorality as earthly, linking it to idolatry — a broader context for 5:1.

In Galatians 5:19, sexual immorality is listed as a work of the flesh, categorizing the sin addressed in 5:1.

Amos 2:7 describes a man and his father going to the same woman, a related but not identical form of sexual sin.

Revelation 21:8 includes the sexually immoral among those headed for the lake of fire—showing the eternal judgment for such sin.