Il rabbino Eliezer dice: un revi'it [una misura specifica del volume, un quarto di un ceppo ] di acque disegnate rende un mikveh non valido all'inizio [cioè se le acque erano nella fossa prima che fossero aggiunte le acque di mikveh valide , come fanno come tre tronchi [di acque disegnate che sono state aggiunte] sulla superficie delle acque [valide]. E i saggi dicono: se all'inizio [prima che ci fossero delle acque nella fossa] o alla fine [dopo che furono aggiunte acque valide per meno di quaranta se'ah ], la misura [per la quantità minima di acque prelevate a invalidare un mikveh ] è di tre registri .
Bartenura on Mishnah Mikvaot
בתחילה – [at first], there wasn’t any water in the Mikveh/ritual bath at all when a quarter [of a LOG] of drawn water fell into it, and afterwards, its measure was completed with rain water.
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English Explanation of Mishnah Mikvaot
Rabbi Eliezer says: a quarter-log of drawn water in the beginning makes the mikveh invalid, and three logs on the surface of the water. According to Rabbi Eliezer there is a difference a case when drawn water falls into the mikveh before water is in the hole in the ground and after valid water has already been put in. If the drawn water falls in first, then all that has to fall in is a quarter of a log, which is a very small amount (about 125 grams). If the drawn water falls in at the end, on the surface of water that is already there, then there must be three logs to disqualify the mikveh.
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Bartenura on Mishnah Mikvaot
על פני המים – after that there was a great deal of kosher water [in the Mikveh, drawn water fell into it].
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English Explanation of Mishnah Mikvaot
But the sages say: both in the beginning and at the end, the measure [which makes the mikveh invalid] is three logs. The other sages rule more leniently. In either case there must be three logs to disqualify the mikveh.
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Bartenura on Mishnah Mikvaot
וחכמים אומרים – and the Halakha is according to the Sages (and see Tractate Eduyot, Chapter 1, Mishnah 3).
