A short story A man is known by the company he keeps?

A man wanted to buy a donkey, and agreed with its owner that he would try out the animal before he bought it. He took the donkey home and put it in the straw-house with all his other donkeys, upon which the new animal left all the other donkeys and at once joined the one that was the most idle and the most greedy eater of them all.

Seeing this, the man put a halter on the new donkey and led him back to the owner. Surprised, the owner asked the man, "How is it possible that you can make an accurate judgment of my donkey in such a short time?"

The man replied, "I don't need a trial; I know that he will be just the same as the lazy, greedy donkey that he chose for his companion."