Commentary for Kiddushin 92:8
בתרי מני צאית בחד מנא לא צאית
but it may not be eaten until terumah and tithes are separated for it from elsewhere!<span class="x" onmousemove="('comment',' Since it is actually tebel, as there was no liability for the unperforated pot. - Produce becomes real terumah only when the separation is made on account of corn that is liable thereto. - Hence the same would apply to hallah.');"><sup>15</sup></span> In respect of two utensils he will obey, but not in respect of one.<span class="x" onmousemove="('comment',' When a priest is told that the produce separated as terumah from a perforated pot upon an unperforated one is not really terumah, and is itself liable, he obeys, as he recognises a distinction between the two. But when told that the hallah separated from flour is not hallah, though the separation is from the same utensil, he will refuse to separate hallah upon that itself.');"><sup>16</sup></span> Alternatively: the priest will indeed obey; but the owner<span class="x" onmousemove="('comment',' I.e., the Israelite who separated it in the first place.');"><sup>17</sup></span>