Related for Oholot 2:1

אֵלּוּ מְטַמְּאִין בְּאֹהֶל. הַמֵּת, וְכַזַּיִת מִן הַמֵּת, וְכַזַּיִת נֶצֶל, וּמְלֹא תַרְוָד רָקָב, הַשִּׁדְרָה, וְהַגֻּלְגֹּלֶת, אֵבָר מִן הַמֵּת וְאֵבָר מִן הַחַי שֶׁיֵּשׁ עֲלֵיהֶן בָּשָׂר כָּרָאוּי, רֹבַע עֲצָמוֹת מֵרֹב הַבִּנְיָן אוֹ מֵרֹב הַמִּנְיָן. וְרֹב בִּנְיָנוֹ וְרֹב מִנְיָנוֹ שֶׁל מֵת, אַף עַל פִּי שֶׁאֵין בָּהֶם רֹבַע, טְמֵאִין. כַּמָּה הוּא רֹב מִנְיָנוֹ, מֵאָה וְעֶשְׂרִים וַחֲמִשָּׁה:

The following impurify through overshadowing: a corpse, an olive-sized piece of a corpse, an olive-sized piece of liquefied corpse, a ladleful of decomposed corpse, the spine, the skull, a limb from a corpse or a limb from a living person that has flesh on it as is appropriate, a <i>Rova</i> [specific unit of volume] of bones comprising the structural majority or the numerical majority, or the structural majority or numerical majority of a corpse, even without amounting to a <i>Rova</i>, impurify. How many is the numerical majority? One hundred and twenty five.

Tosefta Megillah

There is no difference between an olive-sized piece of a corpse and an entire corpse except that the [tumah associated with the] piece of a corpse [exits through] an opening the size of a handbreadth, whereas the [tumah associated with the] entire corpse [exits through] an opening the size of four handbreadths. There is no difference between a olive-sized piece of a corpse and a piece of a bone larger than a barley seed except for the propensity to contaminate other things in a closed space [which a bone does not have]. There is no difference between a limb taken from a corpse and a limb taken from a living person except that flesh from a limb taken from a corpse is tamei and flesh from a limb taken from a live person is tahor.

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