Reference for Bava Batra 181:3

אמרו עליו על ר' אלעזר בן עזריה שהיה משתכר ביין ושמן ביין סבר לה כר"י בשמן באתריה דר' אלעזר בן עזריה שכיח מישחא

in [the case of] oil? — In the place of R. Eleazar b. Azariah oil was plentiful.<span class="x" onmousemove="('comment',' And there was no fear that prices would rise in consequence. ');">⁵</span> Our Rabbis taught: It is not permitted to make a profit in eggs twice. [As to the meaning of 'twice',] Mari b. Mari said: Rab and Samuel are in dispute. One says: Two for one.<span class="x" onmousemove="('comment',' Selling for two shekels, for instance, that which was bought for one. ');">⁶</span>

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