טו דתניא שדה שאבד בה קבר נכנס בתוכה טמא נמצא בתוכה קבר נכנס לתוכה טהור שאני אומר הוא קבר שאבד הוא קבר שנמצא דברי רבי רבן שמעון בן גמליאל אומר תיבדק כל השדה כולה
15 until the uncleanness is revealed, whereas the Sages say: He digs until he reaches a rock or unbroken ground, [after which there is no further uncleanness]. But R'Assi says: The difference of opinion relates to a case where he searched and found [a blemished animal],<span class="x" onmousemove="('comment',' For we fear, according to the first Tanna quoted above, lest the blemished animal found was really another, and, therefore, all the animals require examination, whereas R. Jose maintains that making a search is adequate and, having discovered a blemished animal, we presume that it is the one which became mixed up with the rest.');"><sup>20</sup></span> and they differ on the principle on which Rabbi and R'Simeon B'Gamaliel differ. For it has been taught: If one enters a field in which a grave was lost he becomes unclean. If a grave i found therein, he is clean, for I maintain that the grave found is the identical one which was lost. These are the words of Rabbi, whereas R'Simeon B'Gamaliel says: The entire field must be searched.