Ibn Qayyim in "Medicine of the Prophet" said, "Ibn Samjun said, "There are several kinds of oud and they all carry the general name of Aluwwah. Oud is used in and out of the body and is burned alone or with other substances. There is a medicinal significance when the oud is mixed with camphor as each of them makes the other milder. In addition, burning the oud helps cleanse the air, which is one of the six necessary elements for the body's well-being."