Reference for Menachot 26:3
וכן אתה אומר בשני בזיכי לבונה של לחם הפנים שאין מתיר מפגל את המתיר
What is the point of 'So, too, you may say'?<span class="x" onmousemove="('comment',' It is surely an obvious application of R. Jose's principle!');"><sup>4</sup></span> - You might have supposed that R'Jose's reason in the case of the frankincense [in our Mishnah] was that it was not of the same substance as the meal-offering,<span class="x" onmousemove="('comment',' The mattirs of the meal-offering, the handful and the frankincense, are of different substances, and it might therefore be said that only in such a case does R. Jose hold that a mattir cannot render piggul the other mattir, but not where the mattirs are alike as in the case of the Shewbread.');"><sup>5</sup></span>