Where does the phrase "if the four bodies are not diligent, the five grains are not separated" come from?

If the four bodies are not diligent, the five grains will not be separated. This sentence "If the four bodies are not diligent, the five grains will not be separated" comes from "The Analects of Confucius·Wei Zi Chapter". During the Spring and Autumn Period, Confucius and his students traveled around various countries, and the journey was very hard.

One day, one of Confucius' students fell behind while walking through the jungle. This student was Zi Lu, whom Confucius liked very much. When Zilu was in a hurry, he met an old farmer doing farm work in the fields, so he walked up to him and asked, "Have you seen your master?" This means: Have you seen my teacher? The old farmer glanced at Zilu and replied angrily: "If the four bodies are not diligent and the five grains are not separated, who is the master!" What the old farmer meant was: If you neither work nor know production knowledge, how can you be called a teacher!

Zi Lu felt that his words were too impolite and impolite, so he stood aside respectfully and did not speak for a long time. The old farmer saw that Zilu was still a knowledgeable and sensible person, so he invited Zilu to spend the night at his house, and entertained Zilu warmly in the evening.

The next morning, Zilu caught up with Confucius and his party and told Confucius what happened yesterday. Confucius said: "This must be a cultivated hermit." Confucius wanted to talk to him and asked Zilu to go back to him immediately. When they went, the old farmer and his family were gone.