See Exodus 30:25.
Tempered together - The four substances were perhaps pounded and thoroughly mixed together, and then fused into a mass. This rendering is to be preferred to that in the margin.

And thou shalt make it a perfume,.... By mixing the above spices together:
a confection after the art of the apothecary; in the manner they beat, compound, and mix several ingredients together:
tempered together; or "salted" (l), with salt of Sodom, as Aben Ezra interprets it; and Maimonides (m) says, there was a fourth part of a kab of salt of Sodom put into it: and whether this incense or perfume respects the intercession of Christ or the prayers of his people, they are both savoury and acceptable to God, the latter on account of the former; in all sacrifices salt was used, and every spiritual sacrifice of ours should be seasoned with grace:
pure and holy; such should be the prayers of the saints, and such most certainly is the mediation of Christ, which is his much incense.
(l) "salitum", Montanus, Drusius. Junius & Tremellius, & Piscator. (m) Cele Hamikdash, c. 2. sect. 3.

Of this Moses was to make incense, spicework, etc. (as in Exodus 30:25), salted, seasoned with salt (ממלּח, a denom. from מלח salt), like the meat-offering in Leviticus 2:13. The word does not mean μεμιγμένον, mixtum (lxx, Vulg.), or rubbed to powder, for the rubbing or pulverizing is expressed by שׁחקתּ־הרק in the following verse.