They shall die childless - Either the offspring should not be regarded as lawfully theirs, nor be entitled to any hereditary privileges, or they should have no blessing in their children.
Related Commentaries of Leviticus 20:20
Leviticus 20:20
20 And if a man shall lie with his uncle's wife, he hath uncovered his uncle's nakedness: they shall bear their sin; they shall die childless.