Exodus 30:34

נטף is balsam. Because it is merely the sap which drips from the wood of the balsam tree it is called נטף, “dripping” (Keritot 6a). In old French it is called gomme; English gum. The balm itself, however, is called thériaque (cf., however, Ramban). ושחלת AND ONYCHA This is a root of a fragrant herb, smooth and transparent like a fingernail, In the language of the Mishna it is called צפורן, a nail (cf. Keritot 6a). This is exactly how Onkelos renders it: וטופרא, which is the Aramaic word corresponding to the Hebrew צפורן‎. וחלבנה — This is a malodorous spice which is called galbanum. Scripture enumerates it among the spices of the incense to teach us that we should not regard as a light thing the duty of associating with ourselves when we band together for fasts and prayers Israelites who are transgressors — that they should be counted as ourselves (Keritot 6b). סמים means other SPICES also. ולבנה זכה AND PURE FRANKINCENSE — From here our Rabbis learned that eleven spices were mentioned to Moses on Sinai (a technical term, like הלכה למשה מסיני) as the ingredients of the incense. For the least number implied by the plural סמים is two; balsam, onycha and galbanum are three, making together five. The word סמים that follows (without stating any number) is intended to add a similar number as these already prescribed, viz., five, making ten, and frankincense makes eleven. They are the following: balm, onycha, galbanum, frankincense, myrrh, cassia, spikenard and saffron, altogether eight — for שבלת and נרד are one, it being given this compound name only because the nard resembles a שבלת, a spike, — costus, aromatic bark and cinnamon, altogether eleven. “Borith karshina” (lye obtained from a species of vetch) which is also mentioned in Keritotot 6a in connection with the ingredients of the incense was not burnt itself as incense, but the onycha was rubbed with it in order to whiten it — that it should be (look) better (Keritot 6a). בד בבד יהיה means, these four ingredients mentioned here shall be equal, weight for weight — as the weight of one so shall be the weight of another. Thus indeed we learn (Keritot 6a): the balm, the onycha, the galbanum and the frankincense shall each have the weight of seventy manehs. The term בד seems to me to mean “a single article” (cf. בָּדָד, לְבַד) – they shall be “one equal with one”: they shall be the one the same as the other.

וַיֹּ֩אמֶר֩ יְהֹוָ֨ה אֶל־מֹשֶׁ֜ה קַח־לְךָ֣ סַמִּ֗ים נָטָ֤ף ׀ וּשְׁחֵ֙לֶת֙ וְחֶלְבְּנָ֔ה סַמִּ֖ים וּלְבֹנָ֣ה זַכָּ֑ה בַּ֥ד בְּבַ֖ד יִהְיֶֽה׃

And the Lord said to Moshe, Take to thee sweet spices, storax, and onycha, and galbanum; sweet spices with pure frankincense: of each shall there be a like weight: