Tanach · Rishonim on Tanach · Ibn Ezra · Torah

Ibn Ezra on Leviticus 18:14/אבן עזרא על ויקרא י״ח:י״ד

אדודתך היא. חשובה היא כדודתך וכן הנה חנמאל דודי והנה מה יעשו הסומכים במצות על התורה לבדה כי לא אסר הכתוב אשת אחי האם ולא אם האב ולא אם האם על כן אנחנו צריכים לקבלה ויתכן שלא הזכיר אשת אחי האם כי נלמוד מאשת אחי האב והזכירה בפרשת קדושים גם הנזכרות שלא הזכירם הכתוב דבר על ההוה:
1SHE IS THINE AUNT. She is considered as your aunt.47 Similarly “Behold Hanamel, my uncle.”48. 38 reads: in the presence of Hanamel mine uncle (Jer. 32:6). Be that as it may, I.E.’s point is that Hanamel was not Jeremiah’s uncle. He was the son of Jeremiah’s uncle. Nevertheless, Scripture refers to him as his uncle. Now what will those who rely on the Torah alone for the commandments49 do? For Scripture does not prohibit the wife of the brother of one’s mother, and not the mother of one’s father, or the mother of one’s mother.50 We therefore need tradition. It is possible that the reason that Scripture did not mention that the wife of one’s mother’s brother is prohibited is that we learn this from the prohibition of the wife of the father’s brother. The prohibition of the wife of one’s brother is mentioned in the Torah (Lev. 19:3) portion Ye shall be holy. Also, the reason that those whom I mentioned51 are not listed in Scripture is that the Torah speaks of that which is prevalent.52