Vayikra 18:6-8

Orthodox Jewish Bible

⁶ None of you shall approach to any that is near of kin to legallot ervah (to uncover nakedness, i.e., incestuously dishonor); I am Hashem.

⁷ The nakedness of thy av, or the nakedness of thy em, shalt thou not uncover: she is thy em; thou shalt not uncover her nakedness.

⁸ The nakedness of the wife of thy av shalt thou not uncover; it is the nakedness of thy av.