Quotation for Shabbat 165:1

ורבי עקיבא למאי הלכתא איתקש לנדה למשא לוקשיה לנבלה אין הכי נמי אלא מה נדה אינה לאברין אף ע"ז אינה לאברין אלא הא דבעי רב חמא בר גוריא ע"ז ישנה לאברים או אינה לאברים תיפשוט ליה מהא בין לרבנן בין לרבי עקיבא דאינה לאברים רב חמא בר גוריא כרבה מתני ובעי לה אליבא דרבי עקיבא

Now according to R. Akiba, in respect of what law is it likened to a niddah? [only] in respect of carriage! Then let it be likened to nebelah? — That indeed is so, but [the analogy with niddah, rather, teaches: just as niddah is not a source of contamination] through her [separate] limbs, so is an idol not [a source of contamination] through its limbs. Then when R. Hama b. Guria asked: 'Does the law of an idol operate in respect of its limbs or not?'solve it for him from this, according to both the Rabbis and R. Akiba, that it does not operate in respect of its limbs? — R. Hama b. Guria learns this as Rabbah, and asked it on R. Akiba's view. An objection is raised: An idol is like a [creeping thing] sherez and its service utensils are like a sherez; R. Akiba maintained: An idol is like a niddah, and its service utensils are like a sherez. Now, according to R. Eleazar, it is well; but on Rabbah's view, it is a difficulty? — Rabbah answers you: Is it stronger than the Mishnah, which states, 'The stones, timber and earth thereof defile like a sherez,' and we explained, What is meant by 'like a sherez?' That it does not defile through a cavity-closing stone: here too it means that it does not defile through a cavity-closing stone.

Mishnah Zavim

If a zav [sat] in one scale of the balance, while food and liquids were in the other scale, [the latter become] unclean. In the case of a corpse, everything remains clean except for a man. This is [an example of] the greater stringency applying to a zav than to a corpse; and there is a greater stringency in the case of a corpse than a zav. For whereas the zav defiles all objects on which he sits or lies upon, so that these likewise convey uncleanness to people and garments, and he conveys to what is above him madaf uncleanness, so that these in turn defile food and liquids. Whereas in the case of a corpse no such uncleanness is conveyed. Greater stringency is also found in the case of a corpse, since it can convey uncleanness by overshadowing, and it defiles seven days’ defilement, whereas in the case of a zav no such uncleanness is conveyed.

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