Comentario citado sobre Malaquías 3:3

IN THE BLOOD OF ‘TAHORAH’ (PURIFICATION). According to Rashi this means that even though she sees [an issue of blood during this period of thirty-three days for a male child, and sixty-six for a female], she is nevertheless pure by law of the Torah.²³This as noted above is the Scriptural law. Rabbi Moshe Isserless states the law as it is to be observed today. After commenting that in some places it is customary that during the entire forty-days period for a male-child and eighty for a female, the mother does not purify herself for her husband by immersion in a ritual pool, he states the law to be as follows: “But in those places where there is no such custom, we should not be stringent at all. Rather, immediately after she has not seen blood following the seven-days for a male-child and fourteen for a female, and after she counted a further seven clean days, she is permitted to her husband. But if she again saw even a drop of blood as tiny as a grain of mustard, she is unclean. For although by Scriptural law it is clean blood, yet the custom has already been accepted in all Israel that no coition is permitted if there is clean blood, the law applicable thereto being in every respect like that of other [unclean] blood” (Yoreh Deah 194:1, Rama). And so did Rabbi Abraham ibn Ezra write, that the meaning of the above expression is that “it constitutes pure blood in contrast to the blood of the menstruant, and therefore does not convey impurity, G-d having decreed in the case of a male child [a forty-days period for the after-effects of the childbirth upon the mother — seven impure days and thirty-three pure days], corresponding to the number of days necessary for the form of the male child to be completed in the womb, while that of the female child is double [fourteen impure days and sixty-six pure days, corresponding to the eighty days it takes for the female child to be formed in the mother’s womb]. This is clear and tested.”
But in my opinion the meaning of the word tahorah is cleanness [in a physical sense], similar in meaning to ‘zahav tahor’ (pure gold),³⁶Exodus 25:39. which means smelted and refined. A similar expression is found in the verse, And he shall sit as a refiner and purifier of silver, and he shall purify the sons of Levi, and purge them as gold and silver.³⁷Malachi 3:3. Thus the meaning of the expression here is as follows. Having commanded that a woman who gives birth to a male child be impure for seven days as in the days of her impurity, because then she usually sees issues of blood from the interior of the womb [from which the menses are discharged], He further commanded that she should wait for another thirty-three days, staying in her house in order to cleanse her body; for during all these days she will emit the remnants of blood and the turbid, ill-smelling secretions which come from these bloods, and then she will become cleansed from the childbirth, pregnancy and conception,³⁸See Hosea 9:11. and she may come to the House of G-d. Now our Rabbis have received the tradition that during these [thirty-three days for a male child and sixty-six for a female], she is pure for her husband, because with reference to the seven impure days it says that they are as in the days of the impurity of her sickness,²²Verse 2. but in connection with these [thirty-three days etc.] He said that she is impure as regards [eating or touching] hallowed things and entering the Sanctuary, but not for non-holy things nor for her husband, just as the Rabbis have said,³⁹Chullin 31 a. “Her husband is not a holy object.”
The reason that the time is doubled in the case of the birth of a female child [i.e., fourteen impure days and sixty-six pure days], is perhaps as Rabbi Abraham ibn Ezra said [as mentioned above] in accordance with the opinion of Rabbi Yishmael, that the formation of a male child is completed on the forty-first day, and that of a female child on the eighty-first day. But according to the opinion of the Sages who say that both male and female are completed on the forty-first day, we must say that the reason [why the time is doubled in the case of a female child] is that the nature of the female is cold and moist, and the white [fluid] in the mother’s womb is then exceedingly abundant and cold, this being the reason why she gave birth to a female child. Hence she needs a longer time to become clean [in a physical sense], on account of the abundant moisture in her which contains the ill-smelling blood, and on account of the coldness [of her body], as is well-known that sick people who suffer from cold need a longer period to restore their vigor than those who are hot.

Wir haben in unseren Erörterungen, Jeschurun V. S. 232 ff. nachgewiesen, wie in תנ׳׳ך Metalle überhaupt ihrer stofflichen Kohärenz zufolge als Metapher der Festigkeit und Stärke (z. B. Jeremias 1, 15; Job 6, 12 u. Jesaias 48, 4), hinsichtlich ihres Wertes als Ausdruck der Wertschätzung geistiger Güter (z. B. Prov. 2, 10; Ps. 19, 11 u. Job 28), ganz besonders aber wegen ihrer metallurgischen Eigenschaften als die treffendste Metapher für alles Sittliche und Wahre in allen Abstufungen der Mischung mit sittlich Schlechtem und Unwahrem, sowie für den ganzen Prüfungs- und Läuterungsprozess im Gebiete der Sittlichkeit und Wahrheit vorkommen (z. B. Job 23, 10; Secharja 13, 9; Maleachi 3, 3; Pro. 17, 3; Jesaias 48, 10; Prov. 25, 4. 10, 20 u. 26, 23; Jeremias 6, 29 u. 30; Ps. 119, 119; Jecheskeel 22, 18; Jesaias 1, 22; Daniel 2, 32 u. 33). In allen diesen Stellen charakterisieren Metalle die verschiedenen Grade der sittlichen Reinheit und Wahrheit, und, während Kupfer das Unedle, die noch unveredelte Natur, repräsentiert, Silber die läuterungsbedürftige und läuterungsfähige Stufe bezeichnet, ist Gold, das vorzugsweise gediegen gefunden wird und andererseits die stärkste Probe aushält, Bild des reinsten, gediegensten, sittlichen Adels und der treuen echten Beständigkeit.