Reference for Bekhorot 42:15

חכם מנא ידע

The fact is that R'Simeon learns from [the analogy between] 'passing'<span class="x" onmousemove="('comment',' The text: 'Thou shalt cause to pass (set apart) unto the Lord all that openeth the womb'. (Ex. XIII, 12) stated in connection with the law of the firstling, and the text that passeth under the rod', mentioned in connection with the law of tithing animals.');">¹²</span>

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