《旧五代史·后晋·列传十》
杜知敏已被敌军俘获，皇甫遇对慕容彦超说： 知敏在危急之中，把战马给了我，这是义举，怎能让他落在敌人手中！ 
杜知敏已为所获，遇谓彦超曰： 知敏苍黄之中，以马授我，义也，安可使陷于贼中！ 
Du Zhimin had been captured by the enemy army. Huangfu said to Murong Yanchao: "Zhimin gave me the war horse in a critical moment. This is a righteous act. How can he let him fall into the hands of the enemy!"