Leviticus 20:19

“And thou shalt not uncover the nakedness of thy mother’s sister, nor of thy father’s sister, etc.] An aunt either by mother or father’s side, against which the law is, (<031813>Leviticus 18:13); for he uncovereth his near kin; as an aunt is to a man, and so an uncle to a woman, and both equally criminal; for it is a rule that holds good in all those cases, though not expressed, that what is binding upon one sex is upon the other, being in the same degree of relation, whether of consanguinity or affinity: they shall bear their iniquity; “both” of them, as the Vulgate Latin version, the man and his aunt, and so a woman and her uncle; the guilt of their sin shall be upon them, and the…”

“mother's: Lev 18:12, 13-30; Exo 6:20 uncovereth: Lev 18:6 Leviticus 20:20”

“No civil punishment, on the other hand, to be inflicted by the magistrate or by the community generally, was ordered to follow marriage with an aunt, the sister of father or mother ( Lev 20:19, cf. Lev 18:12-13), with an uncle's wife ( Lev 20:20, cf. Lev 18:4), or with a sister-in-law, a brother's wife ( Lev 20:21, cf. Lev 18:16). In all these cases the threat is simply held out, "they shall bear their iniquity," and (according to Lev 20:20, Lev 20:21) "die childless;" that is to say, God would reserve the punishment to Himself (see at Lev 18:14). In the list of punishments no reference is made to intercourse with a mother ( Lev 18:7) or a granddaughter ( Lev 18:10), as it was taken for…”