Sayyiduna Abu Musa (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "The example of a good companion and a bad companion is like the one who carries musk and the one who blows the bellows. The musk-seller will either offer you some perfume, or you will buy from him, or at least you will get a pleasant fragrance from him; and the one who blows the bellows will either burn your clothes, or else you will get an unpleasant smell."
Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "Musk is the purest of fragrances." And Sayyidah Aishah (may Allah be pleased with her) says: "It is as if I were looking at the glistening of musk in the parting of the hair of the Messenger of Allah (peace and blessings be upon him) while he was in the state of ihram."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11126