Abu Musa (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "The example of a good companion and a bad companion is like that of a musk seller and a blacksmith who blows the bellows. The musk seller may either give you some (musk) as a gift, or you may buy it from him, or at least you will get a pleasant fragrance from him. As for the one who blows the bellows, he may burn your clothes, or you will get a foul smell from him." Agreed upon.
Hadith Referenceمشكوة المصابيح / كتاب الآداب / 5010
Hadith Gradingالألبانی:مُتَّفَقٌ عَلَيْهِ | زبیر علی زئی:متفق عليه
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «متفق عليه، رواه البخاري (5534) و مسلم (146 / 2628)»