Sahih Muslim
The Book Concerning the Use of Correct Words (Kitab Al-Alfaz min Al-Adab wa Ghairiha)
Book Number: 027 / Hadith Number: 5601
Nafi' reported that when Ibn Umar wanted fumigation he got it from aloeswood without mixing anything with it, or he put camphor along with aloeswood and then said: This is how Allah's Messenger (may peace be upon him) fumigated.