Leviticus 18:6
None of you shall approach to any that is near of kin to him, to uncover their nakedness: I am the Lord.
Cross-reference
Leviticus 18:7-19 lists specific close relatives forbidden, elaborating on the general prohibition in Leviticus 18:6.
Leviticus 18:24 warns that the nations became unclean by these very practices, grounding the prohibition in historical judgment.
Leviticus 20:11 prescribes the death penalty for a father's wife, one of the forbidden relations in Leviticus 18:6-8.
Leviticus 20:12 imposes the death penalty for relations with a daughter-in-law, a prohibited close relative in Leviticus 18:6 (18:15).
Leviticus 20:17-21 provides penalties for many of the forbidden relationships listed in Leviticus 18:6, like sister and aunt.
Leviticus 20:19 extends the prohibition to aunts, reinforcing the category of near relatives.
In Genesis 19:33, Lot's daughter lies with her father, a direct example of this prohibition against uncovering a near relative's nakedness.
Genesis 19:36 shows the result of that incest, confirming the violation of this law.
Genesis 19:32 narrates an incestuous plan with a father, illustrating the kind of close relative relations forbidden in Leviticus 18:6.