During the Spring and Autumn Period, Zijia and Zigong, ministers of the State of Zheng, went to pay homage to Duke Linggong of Zheng.

Outside the palace, Zigong suddenly moved his index finger.

Zigong said to Zijia: "Today we have something delicious to eat." Zijia asked why.

Whenever Zi Gong said there was going to be delicious food, his index finger would tremble.

The two of them went to Zheng Linggong's place and saw that, sure enough, Duke Linggong drank the tortoise soup presented by Chu State.

Zijia and Zi Gong looked at each other and smiled.

Duke Ling asked them why they were laughing.

They told Zheng Linggong what had just happened.

Duke Lin was unhappy when he heard this and thought to himself: Okay, Master Zigong, aren't you moving your index finger?

I'll treat everyone to some bastard soup, but I won't let you eat it, Mr. Zi!

Seeing everyone eating and drinking happily, Zigong secretly put his finger into the tortoise soup, tasted the taste, and left.

——This is the origin of "Ranzhi". Zheng Linggong became even more angry. He secretly ate the king's soup without the king's permission, which was a contempt for the king's authority. This was the same as Sun Wukong secretly eating the fairy wine from the Flat Peach Conference.

Linggong had the intention to kill Zi Gong, and Zi Gong also understood that there would be a price to pay for this "touch" with Zi, so he took the initiative and united with Zi's family to kill Linggong.