Reference for Niddah 5:20

התם גברא בחזקת טהרה קאי מספקא לא מחתינן ליה לטומאה

[are all the purifications effected regarded as] clean [if the bath was] In a public domain. If [the inference, however, is made] from the sotah, might it not be argued: It is like the sotah in this respect viz., that as the sotah [if suspected of the offence] in a private domain is regarded as definitely unclean so should also [all purifications effected in this case] be deemed to be definitely unclean [where the bath was] in a private domain? — What a comparison!<span class="x" onmousemove="('comment',' Lit., 'thus, now'. ');">¹⁸</span>

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