Related for Bava Metzia 105:7
וניתי שתי פרוטות ונחלל עלייהו מעשר בפרוטה ומחצה ונחלל האי על היאך יתירא מי סברת פרוטה ומחצה תפסה שתי פרוטות לא פרוטה תפסה פרוטה וחצי פרוטה לא תפסה הדר הויא ליה דאוריית' ודרבנן ודאורייתא ודרבנן לא מצטרפי
Then let him bring <i>demai</i>!<span class="x" onmousemove="('comment',' V. Glos. This too is tithe only by Rabbinic law, and could be combined with the mixed produce. ');"><sup>19</sup></span> — [We fear] lest he thereby bring certain [tithe].<span class="x" onmousemove="('comment',' If he is permitted the remedy of demai, he may think that it is just the same if he brings certain tithe. ');"><sup>20</sup></span> Then let him bring two Perutahs, redeeming the tithe [that he brings] with a <i>perutah</i> and a half, and this [the intermixed tithe] with the rest?<span class="x" onmousemove="('comment',' I.e., let him first bring the other produce which he has to the value of a perutah and a half and redeem it all with the two perutahs; then declare that the half perutah's worth mixed up with hullin is redeemed by the two perutahs already used, in accordance with Hezekiah's teaching. — In the whole of this discussion, every suggestion that the mixed tithe should be capable of redemption on the basis of Hezekiah's ruling is a refutation of his views. ');"><sup>21</sup></span>