Tafsiran Keluaran 30:32: Rashi, Chizkuni, Or HaChaim & Rashbam

לא ייסך with two “yods” has the meaning “he shall not do something” (i. e. it is 3rd person masc. sing. Kal), similar to ייטב in (Deuteronomy 6:18) “that it may be well (ייטב) with thee”.

לא ייסך, “it shall not be poured;” an unusual formulation, meaning the same as if it had been spelled לא יוסך. We encounter a similar pattern in Genesis 50,26 in connection with Joseph’s temporary burial in Egypt, where the Torah reports that his remains were preserved in a casket, by writing: ויישם בארון במצרים, “he was placed in a casket in Egypt,” instead of writing: ויושם.

קדש הוא, "it is holy." This refers to the quantity being sacred. Even if the oil would be compounded of materials not listed here, i.e. something altogether profane, a combination of components in the quantities mentioned here would make it "sacred" in the sense of "forbidden." Anyone concocting such a mixture would be as guilty as a layman offering a total offering or sin-offering on his own behalf. If all such a person wanted to do was to train himself in the art of making such compositions, or in order to donate it to the community, this is permissible as we learned in Keritut 5.

על בשר אדם לא ייסך UPON MAN’S FLESH SHALL IT NOT BE POURED — anything from that selfsame oil (which Moses had prepared).

ובמתכנתו לא תעשו כמהו AND ACCORDING TO ITS PROPORTION YE SHALL NOT MAKE ANY LIKE IT — In regard to the quantities of its spices ye shall not make any other oil like it — i. e. in regard to the weights of these spices in proportion to the measure of a hin of oil; but if one uses less or more of these spices in proportion to the measure of a hin of oil, it is permitted to do so. And even if it is made in the same proportions as this (the oil made by Moses) it is not the one who anoints himself with it that is punishable (for this applies only to one who anoints himself with the oil made by Moses) but he who compounds it (Keritot 5a).

ובמתכנתו is a term denoting amount, as (Exodus 5:8) “the quantity (מתכנת) of bricks”. Similar is the word מתכנת used of the incense (v. 37).