Reference for Keritot 41:44

מ"מ קתני מחשבה ומחשבה לטומאה קלה היא

joined to another edible, which was less than an egg's bulk, but together they made up an egg's bulk.<span class="x" onmousemove="('comment',' There was not the requisite quantity of nebelah. It is, therefore, not in itself unclean, but the portion of nebelah may combine with the other edible to the requisite size of an egg's bulk, which is the standard for food uncleanness. The intention is therefore essential to render the morsel of nebelah an edible, and thus capable of combination with the other food.');">³¹</span>

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