During the Spring and Autumn Period, a man in the State of Song found a piece of Baoyu when he was quarrying in the mountains. He is worried that others will rob him and want to sell him, but he is also afraid of being taken advantage of by businessmen. After careful consideration, he decided to give this treasure jade to senior officials in Beijing. So he took Baoyu to Han Zhai, an official in charge of engineering in Beijing, and presented Baoyu. Zi Han felt very strange and asked, "I don't know you. Why give me Baoyu? " ? I never accept any gifts from others. The man thought that Zi Han suspected that it was a fake jade, so he replied, "I'll let the jade craftsman look at this jade. It's really real jade, and it's priceless, so I gave it to you. Zi Han said: "I regard greed as a treasure, and you regard this jade as a treasure." . If you give it to me, we will both lose our baby. Why don't you and I keep our own treasure? "The man knelt down and pleaded," we ordinary people are afraid to go out with such precious things. I dedicate it to you to avoid disaster. Zi Han asked the man to stay for a while, asked a jade craftsman to carve and process it, then helped him sell jade, gave all the money to the man and sent someone to take him home. This story can be found in Zuo Zhuan's Fifteen Years of Xianggong. Later, people used this idiom to describe the noble quality of honesty and integrity.