Related for Gittin 51:2
אמר ליה בין לר' יהודה בין לר"ש לא שנא תולה בדעת עצמו ולא שנא תולה בדעת אחרים אית להו ברירה
— Raba answered him: Both according to R. Judah and according to R. Simeon, it makes no difference whether he keeps the choice in his own hands or leaves it to another: in either case we do decide retrospectively. There [in the case of the Cuthean wine], however, the reason [for their prohibiting] is as given [in the Mishnah quoted]: 'They said to R. Meir, Do you not admit that if the wine-skin should burst [and the wine be spilt]<span class="x" onmousemove="('comment',' So that it will no longer be possible to set aside the various dues. ');"><sup>2</sup></span>
Tosefta Demai
One who purchases [one hundred logs of] wine from Samaritans on Sabbath Eve [that he intends to drink on Shabbat], and he forgot to separate [tithes from it], says, "Two logs that I will separate in the future, behold, they are terumah, and the ten [logs] closest to them are first tithe, and the nine [logs] closest to them are second tithe." And he deconsecrates [the second tithe and transfers its sanctity to money], and he may drink it immediately [relying on the separation that he will perform later], the words of Rabbi Meir. (Sukkah 23b:5, Steinsaltz tr.) But Rabbi Yehudah, Rabbi Yosei and Rabbi Shimon prohibit [this]. They said to him, to Rabbi Meir, "Do you not concede that if the wineskin [may] burst [and therefore he will not be able to tithe it in the future], [and thus] he has drunk from untithed produce?" He said to them, "When it bursts, [I will be concerned]." (Sukkah 24a:6.)
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