Reference for Bekhorot 60:23

קיבל לטהרות ולא קיבל לכנפים אף לטהרות לא קיבל:

Our Rabbis taught: We accept a haber if he promises to observe cleanness of hands<span class="x" onmousemove="('comment',' Washing the hands before eating and before touching food of terumah.');">⁹</span>

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