Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Abu Musa (may Allah be pleased with him) that he said: A good companion is better than solitude, and solitude is better than a bad companion. Beware! The example of a good companion is like that of perfume; even if he does not give you any, still by being near him you will become fragrant. And beware! The example of a bad companion is like that of a furnace’s smoke; even if it does not burn you, its smell will reach you. Beware! The heart is called “qalb” because of its tendency to turn. Beware! The example of the heart is like a feather hanging from a tree in the open air; the wind keeps turning it over and over, up and down.