12 "Do not have sexual relations with your father's sister, for she is your father's close relative. 13 "Do not have sexual relations with your mother's sister, for she is your mother's close relative. 14 "Do not violate your uncle, your father's brother, by having sexual relations with his wife, for she is your aunt. 15 "Do not have sexual relations with your daughter-in-law; she is your son's wife, so you must not have sexual relations with her. 16 "Do not have sexual relations with your brother's wife, for this would violate your brother. 17 "Do not have sexual relations with both a woman and her daughter. And do not take her granddaughter, whether her son's daughter or her daughter's daughter, and have sexual relations with her. They are close relatives, and this would be a wicked act.
Matthew Henry's Commentary on Leviticus 18:12-17
Chapter Contents
Unlawful marriages and fleshly lusts.
Here is a law against all conformity to the corrupt usages of the heathen. Also laws against incest, against brutal lusts, and barbarous idolatries; and the enforcement of these laws from the ruin of the Canaanites. God here gives moral precepts. Close and constant adherence to God's ordinances is the most effectual preservative from gross sin. The grace of God only will secure us; that grace is to be expected only in the use of the means of grace. Nor does He ever leave any to their hearts' lusts, till they have left him and his services.