Midrash for Bekhorot 91:3
הלכתא אפי' למ"ד נדר שהודר ברבים יש לו הפרה על דעת הרבים אין לו הפרה
But this is only the case with a vow made for a secular purpose, whereas if made for a religious purpose, it can be invalidated,<span class="x" onmousemove="('comment',' As we assume that public opinion would be agreeable to this.');"><sup>2</sup></span>
Sifrei Devarim
"… over the face of the son of the hated one": We are hereby taught that if his head or most of it emerged live (from the womb), he negates the next birth as a first-born.
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