(38) باب فِي الْعَطَّارِ وَبَيْعِ الْمِسْكِ
Narrated Abu Musa:
Allah's Messenger (ﷺ) said, "The example of a good companion (who sits with you) in comparison with a bad one, is like that of the musk seller and the blacksmith's bellows (or furnace); from the first you would either buy musk or enjoy its good smell while the bellows would either burn your clothes or your house, or you get a bad nasty smell thereof."
Reference: Sahih al-Bukhari 2101
In-book reference: Book 34, Hadith 54
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 34, Hadith 314