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”"
SahihSahihSahih MuslimBook 48 · Hadith 96