[There are] three matters that R' Elazar ben Azaryah permits and the Sages prohibit: (a) His cow would go out [into the public domain] with the strap which is between its horns, (b) and one may curry an animal with a metal comb on Yom Tov, (c) and one may grind peppercorns even in their mill [on Yom Tov]. R' Yehudah says: One may not curry an animal with a metal comb on Yom Tov, because he makes a wound [in the pro-cess]; however, [R' Yehudah agrees that] one may curry with a wooden comb. But the Sages say: One may curry neither with a metal comb nor even with a wooden comb.