《北史·列传·卷十一》
于谨过去经常乘坐两匹骏马，一紫一黄，敌军早就熟悉了，于谨便让另两个人各乘一匹马，突围而出。
以常乘骏马一紫一騧，贼先所识，乃使二人各乘一马，突阵而出。
Yu Jin often rode two excellent horses in the past, one purple and one yellow. The enemy had long been familiar with them. Yu Jin asked two other people to ride one horse each and break out of the encirclement.