Yuē fǎ sān zhāng [约法三章]

Originally, it means to make a law which the people agree to abide by. Later, it was generalized to mean the conclusion of simple terms.

Originality

Han Sima Qian, "The Records of the Grandmaster - The Chronicles of Gaozu": "With the fathers and the elders, I made an agreement on three chapters of the law: death to those who kill; wounding and theft to offset the crime."