Reference for Bava Metzia 179:4
וכי תימא מעשר אמעשר נמי לא קשיא כאן במעשר כאן בגידולי מעשר בשלמא גידולי תרומה תרומה אלא גידולי מעשר חולין נינהו דתנן גידולי טבל וגידולי מעשר שני חולין
he must bring a handful of that species and hang it on the nosebag at its mouth. R. Simeon b. Yohai said: He must bring vetches and hang them up for it, because these are better for it than anything else. Now the following contradicts it: When cows are stamping on grain, there is no prohibition of, Thou shalt not muzzle; but when they thresh <i>terumah</i> or tithes, there is. When a heathen threshes with an Israelite's cow, that prohibition is not transgressed;<span class="x" onmousemove="('comment',' I.e., the Jew does not transgress by permitting the Gentile to muzzle his cow. ');"><sup>4</sup></span>
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