"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 (ﷺ) used to burn.'"
Reference: Sunan an-Nasa'i 5135 In-book : Book 48, Hadith 96 English translation : Vol. 6, Book 48, Hadith 5138
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