להבדיל. לֹא בִּלְבַד הַשּׁוֹנֶה, אֶלָּא שֶׁתְּהֵא יוֹדֵעַ וּמַכִּיר וּבָקִי בָּהֶן (ספרא): להבדיל TO MAKE A DISTINCTION — Not that one should only learn the laws, but it is a command that you should know and recognize the differences and be expert in them (Sifra, Shemini, Chapter 12 6).
בין הטמא ובין הטהר. צָרִיךְ לוֹמַר בֵּין חֲמוֹר לְפָרָה, וַהֲלֹא כְבָר מְפֹרָשִׁים הֵם? אֶלָּא בֵּין טְמֵאָה לְךָ לִטְהוֹרָה לְךָ — בֵּין נִשְׁחַט חֶצְיוֹ שֶׁל קָנֶה לְנִשְׁחַט רֻבּוֹ: הטהור בין הטמא ובין BETWEEN THE UNCLEAN AND THE CLEAN — Is it necessary to say. that one should understand to distinguish between the ass and the cow? Have they not already been closely defined as to their distinguishing characteristics? But the meaning is: that you should thoroughly understand to distinguish between what is unclean for you and what is clean for you (i. e. between what is forbidden and what is permitted to you) — between the case of an animal only half of whose wind-pipe has been cut through by the knife, and the case when the greater part has been cut through (in the former case the animal is forbidden, in the latter it is permitted as food) (Sifra, Shemini, Chapter 12 7).
ובין החיה הנאכלת. צָרִיךְ לוֹמַר בֵּין צְבִי לְעָרוֹד וַהֲלֹא כְבָר מְפֹרָשִׁים הֵם? אֶלָּא בֵּין שֶׁנּוֹלְדוּ בָהּ סִימָנֵי טְרֵפָה כְּשֵׁרָה לְנוֹלְדוּ בָהּ סִימָנֵי טְרֵפָה פְּסוּלָה (ספרא): ובין החיה הנאכלת AND BETWEEN AN ANIMAL THAT MAY BE EATEN — Is it necessary to say that one should learn to distinguish between a stag and a wild ass? Have not these already been closely defined as to their distinguishing characteristics? But the meaning is: that you should thoroughly understand to distinguish between the case when there have arisen in it (in the animal) signs by which one might regard it as forbidden (טרפה) and yet it is permitted as food (כשרה), and the case when there have arisen in it signs by which one might regard it as forbidden and because of which it is actually unfitted to be eaten (Sifra, Shemini, Chapter 12 8).