Mesorat%20hashas for Bava Metzia 111:4
מתיב רבינא הלוקח מן הנחתום מעשר מן החמה על הצוננת ומן הצוננת על החמה ואפי' מדפוסים הרבה דברי ר"מ
Rabina raised an objection: If one buys [loaves] from a baker,<span class="x" onmousemove="('comment',' The baker referred to is an 'am-ha-aretz (q.v. Glos.) suspected of omitting the necessary tithes. ');"><sup>7</sup></span> he may tithe from the freshly baked for the stale, and vice versa, and even if they are of many moulds:<span class="x" onmousemove="('comment',' It is a principle that one may separate tithe from one lot of commodities for another, but only when both are liable. Now, as the bread is of different moulds, it might be suggested that the baker bought the wheat from which he made his bread from different merchants, some of whom may have tithed their wheat whilst others had not, and it is forbidden to separate tithe from bread (or corn) already tithed for untithed produce. Nevertheless, since the tithe of demai is Rabbinical only, we assume that the baker had purchased all his wheat from the same merchant, and therefore they had been either all tithed or all untithed. ');"><sup>8</sup></span>
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