Reference for Menachot 159:12
שמואל נמי חדא קאמר כל שבחטאת מתה בתודה אין טעונה לחם מאי קמ"ל לאפוקי מדרבי יוחנן דאמר אדם מתכפר בשבח הקדש קמשמע לן דלא
But surely a thank-offering in such a case would not require the bread-offering!<span class="x" onmousemove="('comment',' For one merely stands to replace the other, and we have learnt that what was brought in the place of a thank-offering does not require the bread-offering. Accordingly Samuel's rule does not hold good.');"><sup>17</sup></span> - Rather Samuel agrees with R'Simeon who maintains that the five sin-offerings must be left to die.<span class="x" onmousemove="('comment',' V. supra p. 482, n. 2. The fourth case would, according to R. Simeon, include the case where two sin-offerings were brought as security, so that the animal which had not been used must be left to die. A thank-offering in such a case would certainly not require the bread-offering, thus in conformity with Samuel's rule.');"><sup>18</sup></span> But R'Simeon holds that under no circumstances [is a sin-offering] to be left to pasture!<span class="x" onmousemove="('comment',' How then can Samuel say, 'Whatever in the case of a sin-offering must be left to pasture'?');"><sup>19</sup></span>