Leviticus 18:14
You may not have sex relations with the wife of your father's brother, for she is of your family;
Leviticus 20:20
And if a man has sex relations with the wife of his father's brother, he has put shame on his father's brother: their sin will be on them; till the day of their death they will have no children.
Treasury of Scripture Knowledge
Summary
Thou shalt not uncover the nakedness of thy father's brother, thou shalt not approach to his wife: she is thine aunt.
General references
Bible References
General references
Leviticus 20:20
And if a man has sex relations with the wife of his father's brother, he has put shame on his father's brother: their sin will be on them; till the day of their death they will have no children.