《国语·晋语·公子重耳夷吾出奔》
晋献公在位的第二十二年，公子重耳被迫出逃。到了柏谷这个地方，占卜求问去齐国或楚国的吉凶。
二十二年，公子重耳出亡，及柏谷，卜适齐、楚。
In the twenty-second year of the reign of Lord Xian of Jin, Prince Chong'er was forced to flee. When he reached the Valley of Cypress, he consulted the oracle about the risks and benefits of escaping to the states of Qi or Chu.