Mishmar/cantab

Men and women, all whose hearts moved them, all who would make an elevation offering of gold to ה׳, came bringing brooches, earrings, rings, and pendants —gold objects of all kinds.

He made the laver of copper and its stand of copper, from the mirrors of the women who performed tasks at the entrance of the Tent of Meeting.

במראת הצבאת OF THE MIRRORS OF THE WOMEN CROWDING — The Israelitish women possessed mirrors of copper into which they used to look when they adorned themselves. Even these did they not hesitate to bring as a contribution towards the Tabernacle. Now Moses was about to reject them since they were made to pander to their vanity, but the Holy One, blessed be He, said to him, “Accept them; these are dearer to Me than all the other contributions, because through them the women reared those huge hosts in Egypt!” For when their husbands were tired through the crushing labour they used to bring them food and drink and induced them to eat. Then they would take the mirrors, and each gazed at herself in her mirror together with her husband, saying endearingly to him, “See, I am handsomer than you!” Thus they awakened their husbands’ affection and subsequently became the mothers of many children, at it is said, (Song 8:5) “I awakened thy love under the apple-tree”, (referring to the fields where the men worked). This is what it refers to when it states, מראות הצבאת “the mirrors of the women who reared the hosts (צבאות)” (Midrash Tanchuma, Pekudei 9). And it was for this reason that the laver was made of them (the mirrors) — because it served the purpose of promoting peace between man and wife viz., by giving of its waters to be drunk by a woman whose husband had shown himself jealous of her and who nevertheless had associated with another (cf. Numbers ch. V) thus affording her an opportunity to prove her innocence (cf. Sotah 15b). You may know that the מראות mentioned in the text were really mirrors (and that the word does not mean visions, or appearance, etc.), for it is said, (v. 29) “And the copper of the wave-offering was seventy talents etc. … and therewith he made [the sockets etc.]” — the laver, however, and its base are not mentioned there amongst the articles made from that copper; hence you may learn that the copper of which the laver was made was not a part of the copper of the weave-offering, which is the only copper mentioned as having been contributed by the people. Thus did R. Tanchuma 2:11:9 explain the term מראת הצבאת. And so does Onkelos also render it: במחזית נשיא, and this first word is the Targum translation of מראות, in the sense of mireors in old French, for we find that for the word (Isaiah 3:23) “And the גליונים”, which are mirrors, we have in the Targum the same word מחזיתא.

[THAT DID SERVICE.] Scripture states this because it is the custom of all women to beautify themselves. They look at their faces in brass or glass mirrors every morning to arrange the head coverings upon their heads. These head coverings are mentioned in the Book of Isaiah. The custom of Israel was the same as the Moslem practice unto this very day. Now there were in Israel women who served God and removed themselves from the pleasures of this world. These women gave their mirrors as a free-will offering because they had no need to beautify themselves. They rather came daily to the door of the tent of meeting to pray and to hear the words of the commandments. Scripture states, that did service (tzave’u) at the door of the tent of meeting because there were many such women.

OF THE MIRRORS ‘HATZOVOTH’ (OF THE SERVING WOMEN). “The women of Israel possessed mirrors of brass which they used to look into when they adorned themselves, and even these they did not withhold [from donating to the Tabernacle]. But Moses was reluctant to accept them because they were made to arouse sensual desires. Said the Holy One, blessed be He, to Moses: ‘These are dearer to Me than all [other donations], for by means of them the women raised many hosts in Egypt, etc. For this reason the laver was made from these mirrors, because it was used in order to bring peace between husband and wife; for it was out of this laver that they took the water which they give to drink to a woman who was warned by her husband not to meet a certain man privately and who had nevertheless associated with him.” This is Rashi’s language.
The meaning of this Midrash is that in the whole work of the Tabernacle they accepted ornaments from women, as it is written, And they came, both men and women… and brought nose-rings, and ear-rings, and signet-rings ‘v’chumaz’ — the chumaz, according to its Midrashic interpretation, being even more undesirable. There, however, all the donations became mixed together, whereas here they were to make one specific vessel purely from ornaments [i.e., the mirrors] which were made to arouse sensual desire. Therefore Moses did not consent at first [to accept them] until he was told to do so by the Almighty.
But I do not know how to explain according to this Midrash the phrase — that did service at the door of the Tent of Meeting — [since the Tent of Meeting had not yet been put up]. Perhaps it can be said that the women brought this donation to Moses’ tent, which he called the Tent of Meeting, and he himself received it from them by word of G-d, since the tent of the Tabernacle had not yet been made. Onkelos’ translation, “women that came to pray at the door of the Tent of Meeting,” accords approximately to the words of Rabbi Abraham ibn Ezra, who said that these women worshipped G-d, and turned away from the desires of this world and gave their mirrors as a donation, coming each day to the door of the Tent of Meeting to pray and to hear instruction about the commandments.
In line with the plain meaning of Scripture, it is also possible to say that Moses made the laver and its base for the mirrors of the women who came in a great crowd, and assembled at the door of the Tent of Meeting in order to give their mirrors in the generosity of their hearts. Now the brass of the mirrors was burnished brass, resplendent and very beautiful. It is for this reason that he set aside this brass from the beginning for the making of this vessel. Upon seeing this [that Moses accepted it from them], the women gathered and came in many hosts, all of them wanting to give their mirrors for the making of the whole laver and its base. It is also correct to explain that they had in mind right at the start to offer them for the laver because of its use in connection with the suspected adulteress [as explained above], and they accepted the law [of the suspected adulteress] upon themselves with joy, and offered to give all their mirrors.
Pekudei