Reference for Sotah 90:2
מאי לאו בהא קא מיפלגי דמר סבר מין במינו הוי טמון ומר סבר לא הוי טמון
of the opinion that these Tannaim agreed with R. Judah who said: 'In the field', i.e., to the exclusion of one which is hidden. Do they, then, not differ on this issue: One holds that with two things of the same kind [the lower] is regarded as hidden, and the other holds it is not regarded as hidden? — No; if they were of the same opinion as R. Judah, they all agree that with two things of the same kind [the lower] is regarded as hidden; but here the difference is the same as that of R. Judah and the Rabbis. The Rabbis here agree with the Rabbis there,<span class="x" onmousemove="('comment',' Who maintained that a hidden sheaf came within the law of the forgotten sheaf. ');"><sup>2</sup></span>