´It was narrated that Nafi' said:` "When Ibn 'Umar burned incense he would burn Al-Uluwwah that was not mixed with anything else, or camphor mixed with some Al-Uluwwah. Then he said: 'This is what the Messenger of Allah [SAW] used to burn.'"
Hadith Referenceسنن نسائي / كتاب الزينة من السنن / 5138
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم
Urdu marginal note: “Bukhoor” is derived from “bukhar” (vapor). Since fragrant wood, when ignited, emits vapors that spread fragrance, this type of perfume is called “bukhoor.” Otherwise, bukhoor is not the name of any one specific thing.
Source: Sunan Nasa'i: Translation and Benefits by Shaykh Hafiz Muhammad Amin Hafizullah, Page: 5138