《农夫和蛇》是《伊索寓言》中的一个经典故事，以下是该故事的原文（英文版本及常见的中文翻译）：
英文版原文： A Winter's Day, a Farmer found a Snake stiff and cold. He had pity on it, and took it up and put it in his bosom. The Snake was quickly revived by the warmth, and resuming its natural instincts, bit the Man who had saved its life. "Oh," cried the Poor Man with his last breath, "I am justly served for pitying a scoundrel."
中文版翻译： 在一个寒冷的冬天里，一位农夫发现了一条冻僵了的蛇。他很可怜它，便把它捡起来放进自己的怀里。那蛇受了暖气后渐渐苏醒了过来，恢复了它的本性，咬了救它的那个人一口。临死前，农夫说道：“哎，我怜悯恶人，真是应该受到这样的惩罚啊！”
这个故事教导人们要认清并远离那些本性邪恶的人，即使他们暂时表现出无害或需要帮助的样子，因为他们的本质是不会轻易改变的。
