Talmud for Bava Batra 5:6
אַרְבַּע מִדּוֹת בַּמּוֹכְרִין. מָכַר לוֹ חִטִּים יָפוֹת וְנִמְצְאוּ רָעוֹת, הַלּוֹקֵחַ יָכוֹל לַחֲזֹר בּוֹ. רָעוֹת וְנִמְצְאוּ יָפוֹת, מוֹכֵר יָכוֹל לַחֲזֹר בּוֹ. רָעוֹת וְנִמְצְאוּ רָעוֹת, יָפוֹת וְנִמְצְאוּ יָפוֹת, אֵין אֶחָד מֵהֶם יָכוֹל לַחֲזֹר בּוֹ. שְׁחַמְתִּית וְנִמְצֵאת לְבָנָה, לְבָנָה וְנִמְצֵאת שְׁחַמְתִּית, עֵצִים שֶׁל זַיִת וְנִמְצְאוּ שֶׁל שִׁקְמָה, שֶׁל שִׁקְמָה וְנִמְצְאוּ שֶׁל זַיִת, יַיִן וְנִמְצָא חֹמֶץ, חֹמֶץ וְנִמְצָא יַיִן, שְׁנֵיהֶם יְכוֹלִין לַחֲזֹר בָּהֶן:
There are four "measures" [distinct laws] in respect to sales: If he sold him good wheat and it was found to be bad, the buyer can back out. [i.e., If it were stipulated that he be given good wheat and it was found to be bad, it is like ona'ah ("wronging," overcharging). Therefore, only the object of the ona'ah, the buyer, can back out, but not the seller, even if the price of wheat rose greatly.] (If it were stipulated that he be given) bad wheat and it was found to be good, the seller can back out. Bad and found to be bad; good and found to be good, neither can back out [even if the price rose or fell. And the buyer cannot say: "I intended good wheat — I said 'bad' only by way of (Proverbs 19:8): '"Bad, bad," the buyer says.'" And, conversely, the seller cannot say: "I intended bad wheat — I said 'good' only because it is the way of a seller to call bad good."] Shechamtith [red (-brown). The Targum of (Genesis 30:35): "And all chum" (brown) is: "And all shechum."], and it were found to be white; white, and it were found to be shechamtith — Olive wood, and it were found to be sycamore wood; sycamore, and it were found to be olive — Wine, and it were found to be vinegar; vinegar, and it were found to be wine — both can back out. [For some prefer the one, and others, the other. All such instances are a mekach tauth (a "mistaken sale") for both, and both can back out, whereas in the instance of "good, and they were found to be bad," all prefer the good. [("Wine, and it were found to be vinegar, etc.":) Some prefer wine; others, vinegar.]
Jerusalem Talmud Sheviit
Jerusalem Talmud Peah
It happened that Rebbi Simeon from Miẓpah93A Mishnah collector in the times of Rabban Gamliel I; one of a very small number of scholars who lived during Second Temple times who is always mentioned with the title “Rebbi.” {It is possible that before the destruction of the Temple, “Rebbi” did not designate a rabbi but a collector of legal statements.} Miẓpah probably is today’s Nebi Samwil, N. W. of Jerusalem. sowed before Rabban Gamliel; they ascended to the stone hall94The hall on the Temple Mount whose walls were formed by hewn stone and in which the high court held its sessions. and asked. Naḥum the scribe95Cf. Latin libellaris, “of books.” He was the clerk of Rabban Gamliel I’s court. said: I have the tradition from Rebbi Miasha, who received it from my father, who received it from the pairs96The pairs of authorities, chiefs and deputy chiefs of the high court in Jerusalem, who are mentioned in the first chapter of Pirqe Avot., who received if from the prophets97Ḥaggai, Zachariah, Malachi, who by tradition are counted as members of the “Great Assembly.”, a practice going back to Moses on Sinai, that he who sows two different kinds of wheat on his field gives one peah if he stores them together, two peot if he stores them separately.