ציטירנדיקער פּירוש אויף ירמיהו 32:6

she is your aunt You are to consider her your aunt, although she is not a blood relative (compare “my uncle Ḥanam’el” [Jeremiah 32:12], although Ḥanam’el was not technically Jeremiah’s uncle). What will they do who derive their Commandments from the written Torah alone? Scripture does not explicitly prohibit sexual relations with the mother’s brother’s wife, nor with the paternal grandmother, nor with the maternal grandmother. Consequently, we need the Oral Tradition (possibly Scripture does not mention a mother’s brother’s wife because we can generalize from the case of the father’s brother’s wife, and also because it is alluded to in the parasha of Qedoshim [20:20]; the two other abovementioned relations are not mentioned, because Scripture deals only with behaviors that are known to occur).