《左传·哀公·哀公八年》
八年春季，周历正月，宋景公攻入曹国，抓住了曹伯阳带回宋国。
八年春，王正月，宋公入曹，以曹伯阳归。
In the spring of the eighth year, the first month of the Zhou calendar, Duke Jing of Song invaded the state of Cao, capturing Bo Yang of Cao and escorting him back to Song.