Leviticus 18:13

“Thou shalt not uncover the nakedness of thy mother’s sister, etc.] Which is the same relation as before, an aunt by the mother’s side; wherefore, if such a marriage was unlawful, this must also, and for the same reason: for she [is] thy mother’s near kinswoman; the same phraseology is used here as in the preceding verse; (see Gill on “<031812>Leviticus 18:12”); and by the same rule a woman might not marry her uncle, whether by father or mother’s side, the relation being the same, and this reaches to great-uncle and great-aunt; instances of women marrying their uncles, and men their aunts, among the Heathens, have been given, as among the Persians and Lacedaemonians by Herodotus f633, and…”