Cao Cao once gave Guan Yu a shirt, but Guan Yu refused to accept it to show his loyalty to Liu Bei.

The original words in Romance are: One day, Cao Cao saw Guan Gong's blue brocade shirt was worn out, so he measured it and gave it to him as a gift. Guan Yu took it and put it under his clothes, still covered with an old robe. Cao Cao smiled and said, "Why is the cloud so frugal?" Gong said: "First, it is not frugal. This old robe is a gift from Liu Huangshu. Some people wear it as if they saw their brother's face. They dare not forget their brother's old gift with the new gift of the prime minister, so they put it on. " -This shows Guan Yu's benevolence and righteousness, and he did not give up Liu Bei's benevolence and righteousness because of Cao Cao's kindness!