Bava Metzia 99
שוה שש בחמש מי נתאנה מוכר יד מוכר על העליונה רצה אומר לו תן לי מקחי או תן לי מה שאוניתני
six [<i>ma'ahs</i>] worth for five — who was overreached? The vendor. Therefore the vendor has the upper hand!He can either say, 'Return me the purchase', Or, 'Return me the sum underpaid'.<span class="x" onmousemove="('comment',' The figures given agree with Samuel. ');"><sup>1</sup></span>
איבעיא להו פחות משתות לרבנן לאלתר הויא מחילה או בכדי שיראה לתגר או לקרובו ואם תמצי לומר בכדי שיראה לתגר או לקרובו מאי איכא בין שתות לפחות משתות
The scholars propounded; On the view of the Rabbis, does [an overcharge of] less than a sixth immediately constitute renunciation, or only when he has had time to shew [the purchase] to a merchant or relative?<span class="x" onmousemove="('comment',' E.g., if eleven ma'ahs was paid for an article worth ten, is the vendee regarded as having there and then renounced the eleventh ma'ah, and so, even if he immediately demands its return, he has no redress; or perhaps it is accounted renunciation only if sufficient time elapsed to shew it to a merchant, but before that he can claim a refund? ');"><sup>2</sup></span>
איכא דאילו שתות ידו על העליונה רצה חוזר רצה קונה ומחזיר אונאה ואילו פחות משתות קנה ומחזיר אונאה
And should you object, [If it is] only when he has had time to shew [the purchase] to a merchant or a relative, wherein do a sixth and less than a sixth differ? [Yet] there is a difference, for in the case of a sixth, he has the upper hand, and can either withdraw or retain the ownership but have the overcharge returned; whereas in the case of less than a sixth, he must retain ownership and have the overcharge refunded. What then is our ruling? — Come and hear: [AND SO] THEY REVERTED TO THE RULING OF THE SAGES. Now, it was thought that less than a third on R. Tarfon's view is identical [in law] with less than a sixth on the view of the Rabbis. Now, should you say that [an overcharge of] less than a sixth, in the view of the Rabbis, [constitutes renunciation only] when he has had time to shew [the purchase] to a merchant or a relative, whereas according to R. Tarfon, the whole day [must pass before he loses the rights of redress], it is well: on that account they [the merchants] reverted [to the ruling of the Sages]. But if you say that less than a sixth, in the view of the Rabbis, immediately constitutes renunciation,