Levítico 20:17

17 E quando hum varão tomar sua irmã, filha de seu pai, ou filha de sua mai; e elle vir as vergonhas della, e ella vir as suas; torpeza he: por tanto serão desarreigados perante os olhos dos filhos de seu povo: descubrio as vergonhas de sua irmã,levará sua iniquidade.

17 And if a man takes his sister, daughter of his father or his mother, and has sex relations with her and she with him, it is an act of shame: they are to be cut off before the children of their people; he has had sex relations with his sister, and his sin will be on him.