בני ישראל מצווים לפרוש מנשותיהם לפני מעמד הר סיני. חז"ל הסיקו מכך שמשה פרש מאשתו בדרך קבע (במדבר יב), בכדי שיתאפשר לו בכל עת לדבר עם אלוהים. לעומת פירוש זה, רבי יוסף אבן כספי (המאה ה־14 לערך) טוען שמדובר בסילוף של פשט הכתוב, ושפרישות שכזו היא עלבון להשקפת העולם היהודית.
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