《资治通鉴·汉纪·汉纪三十六》
两名骨都侯对比的意图颇有觉察，适逢五月龙城祭祀，他们便劝单于杀比。
两骨都侯颇觉其意，会五月龙祠，劝单于诛比。
The two bone dukes were somewhat aware of Bi's intentions, and when the time was right for the fifth month sacrifice at Longcheng, they advised Shanyu to kill Bi.