Reference for Bava Metzia 159:9
הכי קאמר היכא דלא שני חטין והביא חטין שעורין והביא שעורין כמה יוסיף על משאו ויהא חייב סומכוס אומר משום ר"מ סאה לגמל שלשה קבין לחמור
It has been taught likewise: If one sold a maidservant to his neighbour. and informed him, 'This maidservant is an idiot, an epileptic, and a dullard;' and she possessed one of these defects, which he inserted amongst the others [which she did not have]; it is a sale in error. [But if the vendor said, 'She has] this defect' [which she actually possessed], 'and another too' [not specifying which], it is not a sale in error. Said R. Aha the son of Raba to R. Ashi: What if she had all these defects? — R. Mordecai observed to R. Ashi: Thus do we say in Raba's name: If she had all these defects, it is not a sale in error.<span class="x" onmousemove="('comment',' For the buyer cannot plead that he thought that the vendor was enumerating many fictitious defects in order to deceive him about a real one. ');"><sup>8</sup></span>