Vayikra 18:5-7

Orthodox Jewish Bible

⁵ Ye shall therefore be shomer over My chukkot, and My mishpatim; which if an ish do, he shall live by them: I am Hashem.

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.