Related for Bava Batra 168:3
אם אינו קדוש נשיאות חטא למה מכאן לתורם מן הרעה על היפה שתרומתו תרומה
Hence [it may be inferred] that if one separates a heave-offering from an inferior quality for [the redemption of] a superior quality, his offering is valid.<span class="x" onmousemove="('comment',' Infra 143a; B. M. 56a. ');"><sup>5</sup></span> As regards commercial transactions, however, all [are of the opinion that wine and vinegar are not of the same kind] because some one may like wine and not vinegar while another may like vinegar and not wine.<span class="x" onmousemove="('comment',' Hence, though wine and vinegar may be regarded as belonging to the same kind, the sale of one in lieu of the other is not valid, and both buyer and seller may, therefore, withdraw according to the opinion of all, including that of the Rabbis. ');"><sup>6</sup></span>