Deuteronomy 27:22

Cursed be he that lieth with his sister, the daughter of his father, or the daughter of his mother. And all the people shall say, Amen.

Cross-reference

Leviticus 18:9 explicitly prohibits uncovering a sister's nakedness, directly paralleling the curse in Deuteronomy 27:22.

Leviticus 20:17 outlines the penalty for marrying a sister, expanding on the curse in Deuteronomy 27:22 with a specific consequence.

2 Samuel 13:1 introduces Amnon's incest with his half-sister Tamar—a narrative example of the sin cursed in Deuteronomy 27:22.

In 2 Samuel 13:8-14, this curse is exemplified by Amnon's rape of his half-sister Tamar, showing the sin's real-life horror.

In Ezekiel 22:11, the prophet lists the same sin of violating a sister among Israel's abominations, echoing this curse.