《北齐书·列传·卷十五》
后来破周军于河阴，商议追击，高祖下令愿追者在西，不主张追击者在束边，祇有潘乐和刘丰在西边。
后破周师于河阴，议欲追之，令追者在西，不愿者东，唯乐与刘丰居西。
Later, when a plan to pursue the defeated Zhou troops at Heyin was being discussed, Emperor Wu ordered those who favored the pursuit to stand to his west and those against to his east. Only Ban Le and Liu Feng stood to the west.