One day, seated in the ancestral hall, King Hui of Liang saw a man leading an ox pass by. He asked:
"Where are you taking the ox?"
The man leading the ox stopped and answered:
"I am taking it to be slaughtered and will use its blood to paint the bell."
As King Hui heard this, he felt pity for the ox and said:
"How can that be done? You are too cruel. Let it go at once. It is not guilty. How can you kill it? I cannot bear to see it panic-stricken, shedding tears and trembling before its death."
The man leading the ox asked:
"Do you mean that I shall let the ox go and not paint the bell? Is that it?"
King Hui answered:
"What are you saying? How can you not paint the bell！ Let the ox go, but use a sheep instead."