Reference for Yevamot 230:6
א"ל רבינא לרב אשי ולא חיישינן שמא פינן אימא סיפא ר' יוסי אומר אפילו מצא חבית וכתוב עליה תרומה הרי אלו חולין שאני אומר אשתקד הוה מלא תרומה ופינה
they used to write a Taw for <i>terumah</i>!<span class="x" onmousemove="('comment',' M.Sh IV, 11. This proves that a mark is regarded as sufficient proof that the original contents were not removed and replaced by others! ');"><sup>15</sup></span> — Said Rabina to R. Ashi: Do we not [in such circumstances]<span class="x" onmousemove="('comment',' v. supra note 1. ');"><sup>16</sup></span> heed the possibility that [the contents of a vessel] may have been removed? Read, then, the final clause: R. Jose said, Even if a man found a jar on which '<i>terumah</i>' was inscribed [the contents] are nevertheless regarded as unconsecrated, for it is assumed<span class="x" onmousemove="('comment',' Since most of the world's produce is unconsecrated. ');"><sup>17</sup></span>