הלכה על כריתות 10:34

From the roots of the commandment is what we have written in the prohibition of its anointing (Sefer HaChinukh 108). The content of the commandment - [that which] they, may their memory be blessed, said (Keritot 5b), that none of it was ever made besides the one that Moshe made in the wilderness; and they said that a miracle was performed with it, that it is all preserved for the future to come, and [its] blessing replaced that which they expended from it to anoint the tabernacle and its vessels; that one is not liable for its making unless he makes it according to the amount of its spices, and that is the [meaning of the] expression, "specification,' which expresses a calculation, [as] in the calculation of its spices; and the rest of its details - are elucidated in the first chapter of Keritot.