《淮南子·道应训》
晋文公征伐原邑，和大夫们约定三天攻克。但打了三天，原人还没投降，于是文公依约下令撤兵离去。
晋文公伐原，与大夫期三日，三日而原不降，文公令去之。
Duke Wen of Jin conquered Yuan, and he made an agreement with the officials to conquer it within three days. However, after three days of fighting, Yuan still didn’t surrender, so Duke Wen withdrew his troops as agreed.