The Man and the Snake

The Fables of Phædrus
He who gives relief to the wicked has to repent it before long.
A Man took up a Snake stiffened with frost, and warmed her in his bosom, being compassionate to his own undoing; for when she had recovered, she instantly killed the Man. On another one asking her the reason of this crime, she made answer: “That people may learn not to assist the wicked.”