《宋书·列传·卷五十九》
敌使者还没有送走这个口信，拓跋焘又派使者命令孝伯传话说： 魏主有诏给太尉、安北，近来我们的骑兵先到，车辆还在后面，闲着无事可做，你们如有赌博的工具可以借我们一用。 
此信未去，焘复遣使令孝伯传语曰： 魏主有诏语太尉、安北，近以骑至，车两在后，今端坐无为，有博具可见借。 
The foreign messenger hadn’t left to deliver the message when Tuoba Tao sent another messenger with the order for Xiao Bo to say: The King of Wei has an imperial edict for the Grand Commandant and the Northern Anbei: Our cavalry arrived first and our chariots are still on the way. We have nothing to do right now; if you have any game equipment that you can lend us, please do.