《韩非子·外储说右下》
百姓说； 国君生病，我们为他祈祷；现在他病好了，我们杀牛向神还愿。 
百姓曰： 人主病，为之祷；今病愈，杀牛塞祷。 
The people said, "The ruler was sick, and we prayed for him; now that he is cured, we are killing cows and offering them to the gods."