Reference for Bava Batra 240:5

והא ראשי המטות כתיב ביה כדאמר רב חסדא אמר רבי יוחנן ביחיד מומחה ה"נ ביחיד מומחה

[just referred to]? — It was taught: This is the thing, has been said here,<span class="x" onmousemove="('comment',' At the laws of vows (Num. XXX, 2). ');">¹⁷</span> and This is the thing, has [also] been said elsewhere:<span class="x" onmousemove="('comment',' Lev. XVII, 2, at the law of animals slaughtered outside the Temple. ');">¹⁸</span> just as there [it was spoken to] Aaron and his sons and all Israel,<span class="x" onmousemove="('comment',' As stated specifically in Lev. XVII, 2. ');">¹⁹</span> so here<span class="x" onmousemove="('comment',' In connection with the laws relating to vows. ');">²⁰</span>

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