Commentary for Nedarim 29:11
אמר רבי אבא הלכה לפני הפסח אסורה ולוקה לא הלכה אסורה בעלמא
— Yes. Even as it was taught: Things which are permitted, yet some treat them as forbidden, you must not permit them in their presence, because it is written, he shall not break his word.<span class="x" onmousemove="('comment',' When one is accustomed to treat a thing as forbidden, it is as though it were subject to a vow. Thus, though the prohibitive force of custom is Rabbinical only, the Biblical injunction applies to it. ');"><sup>11</sup></span>
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