דברי הימים א, פרק ט׳, פסוק ל׳

Creating the sacred incense was a highly specialized craft entrusted to a specific, designated family from among the priests. The primary approach among commentators is that this family held the exclusive responsibility of processing the aromatic spices. Their role involved carefully crushing the raw ingredients and blending them together to produce the final incense.

This process of compounding is essentially the work of a master perfumer, requiring a deep understanding of how to properly mix the fragrant elements. Because of the sacred nature of the incense, the priests carried out this task with extreme precision. They strictly followed the exact methods and instructions originally laid out in the Torah, ensuring the mixture was prepared perfectly every time.