《资治通鉴·汉纪·汉纪八》
过去宋宣公不传位给儿子而传位给弟弟，因此产生了祸乱，祸乱持续了五代人。
昔宋宣公不立子而立弟，以生祸乱，五世不绝。
In the past, Duke Xuan of Song passed his position not to his son but to his younger brother, which caused chaos that lasted for five generations.