Aesop's Fables (1884)
24. The Game-cocks and the Partridge.
A Man had two Game-cocks in his poultry yard. One day, by chance, he fell in with a tame Partridge for sale. He purchased it, and brought it home that it might be reared with his Game-cocks. On its being put into the poultry-yard, they struck at it, and followed it about, so that the Partridge was grievously troubled in mind, and supposed that he was thus badly treated because he was a stranger. Not long afterwards he saw the Cocks fighting together, and not separating before one had well beaten the other. He then said to himself: "I shall no longer distress myself at being struck at by these Game-cocks, when I see that they cannot even refrain from quarreling with each other."
Strangers should avoid those who quarrel among themselves.
Aesop's Fables: A New Revised Version From Original Sources (translator not identified), 1884 . Illustrations by Ernest Henry Griset (1844-1907), John Tenniel (1820-1914) and Harrison Weir (1824-1906). Available online at Project Gutenberg.