8עַצְמוֹת הַשֶּׁרֶץ וְגִידָיו וְצִפָּרְנָיו טְהוֹרִין. וְעוֹר הַחלֶד וְהָעַכְבָּר וְהַצָּב וְהַתִּנְשֶׁמֶת טָהוֹר אַף עַל פִּי שֶׁהוּא לַח וַעֲדַיִן לֹא עִבְּדוֹ וְלֹא הָלַךְ בּוֹ. אֲבָל עוֹר הָאֲנָקָה וְהַכֹּחַ וְהַלְּטָאָה וְהַחֹמֶט כִּבְשָׂרָן וּמְטַמֵּא בְּכַעֲדָשָׁה. וְאִם עִבְּדָן אוֹ שֶׁהִלֵּךְ בָּהֶן כְּדֵי עֲבוֹדָה טְהוֹרִין. וְכַמָּה הִיא כְּדֵי עֲבוֹדָה כְּדֵי הִלּוּךְ אַרְבָּעָה מִילִין:
The bones of the swarming creature and its sinews and claws are pure. And the skin of the "choled" (rat, weasel, mole rat, or mongoose), of the mouse, of the "tzav" (toad or spiny-tailed lizard), and of the "tinshemeth" (mole rat, gecko, chameleon, or monitor) are pure even when still moist and not yet tanned nor trodden upon. However, the skin of the "anakah" (gecko, hedgehog, or glass lizard), of the "koach" (chameleon), of the "letaah" (lizard), and of the "chomet" (snail) are like their flesh and a lentil-sized portion of it imparts impurity. And if they were tanned, or trodden upon till tanned, they are pure. And how much [must one tread on a skin ] to tan it? As much as it takes to walk four "millin" (~3.7 miles).