Reference for Bekhorot 119:38

יצאו שנים כאחת מונה אותן שנים שנים מנאן אחד תשיעי ועשירי מקולקלין

I only say [that the holiness of the tenth is determined by the counting of the animals] where he planned to bring them out in pairs, but where [as in the Mishnah] they came out [of the shed] of themselves,<span class="x" onmousemove="('comment',' The Mishnah saying distinctly: IF THEY CAME OUT etc.');">³¹</span>

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