Imamat 18:11

18:11 You must not have sexual intercourse with the daughter of your father’s wife born of your father; she is your sister. You must not have intercourse with her. ¹ 

Imamat 21:2

21:2 except for his close relative who is near to him: ²  his mother, his father, his son, his daughter, his brother,

[18:11]  ¹ tn Heb “The nakedness of the daughter of your father’s wife born of your father, she is your sister; you must not uncover her nakedness.” That is, a half sister, the daughter of the man’s father by another wife, who is not the man’s mother, is to be considered a true sister. Therefore, the man must not have sexual intercourse with her.

[21:2]  ² tn Heb “except for his flesh, the one near to him.”