The Charcoal-Burner and the Fuller

by Aesop

A CHARCOAL-BURNER carried on his trade in his own house. One day he met a friend, a Fuller, and entreated him to come and live with him, saying that they should be far better neighbors, and that their housekeeping expenses would be lessened. The Fuller replied: The arrangement is impossible as far as I am concerned, for whatever I should whiten, you would immediately blacken again with your charcoal.

Moral:
Like will draw like.