Musnad Ahmad 788:140

Sufyan narrated to us, from Burayd ibn Abdullah ibn Abi Burdah, from Abi Burdah, from Abu Musa, in a narration, he said: "The believer to the believer is like a structure, parts of which strengthen other parts." "And the likeness of the righteous companion is like the perfume seller; if he does not give you of his perfume, you will be attached by his scent. And the likeness of the evil companion is like the bellows; if it does not burn you, you will be reached by its sparks." "And the trustworthy treasurer who performs what he is commanded to do, seeking reward, is one of the two who give charity."