Related for Bava Batra 168:7
<big><strong>גמ׳</strong></big> א"ר אסי א"ר יוחנן מדד והניח על גבי סימטא קנה
IF ONE BUYS FLAX FROM ANOTHER, HE DOES NOT ACQUIRE OWNERSHIP UNTIL HE MOVES IT FROM PLACE TO PLACE. AND IF IT WAS ATTACHED TO THE GROUND AND HE PLUCKED [OF IT] ANY QUANTITY, HE ACQUIRES OWNERSHIP. <b><i>GEMARA</i></b>. R. Assi said in the name of R. Johanan: [If the buyer] has measured [with the seller's instruments] and has put [them] in an alley, he acquires possession.<span class="x" onmousemove="('comment',' V. n. 1. ');"><sup>12</sup></span>
Tosefta Terumot
One who [intends to] take terumah from a barrel of wine and discovers that it is vinegar, if he knew it was vinegar [at any point] before he took terumah, it is not [valid] terumah (Ter. 3:1). But if it turned into vinegar [after he set it aside], behold, this is [valid] terumah. In case of doubt involving terumah, he goes back and takes terumah [a second time], the words of Rabbi Yosei, since Rabbi Yosei says, wine and vinegar are two kinds. But the Sages say, they are one kind.
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