1687. Narrated Aboo Moosa (radhi Allaahu anhu) : The Prophet (Sallallaahu Alaihi Wasallam) said,
The example of a good righteous companion and an evil one is that of a person carrying musk and another blowing a pair of bellows. The one who is carrying musk will either give you some perfume as a present, or (at least) you will buy some from him, or you will get a good smell from him; but the one who is blowing a pair of bellows will either burn your clothes or you will get a bad smell from him.
[Saheeh Al-Bukhaari, Hadeeth No. 442, Vol. 7]
Source : The Book of Kindness Relations and Manners – Chapter 45 – Preference of having righteous good companions and to keep away from evil companions. Al-Lulu Wal-Marjan,Compiled by : Fuwad Abdul-Baqi, Translated by : Dr. Muhammad Muhsin Khan