《史记·八书·平准书》
如今天下不幸有危急的事发生，而卜式奋勇请求父子为此献身，虽没有参加战斗，心中的义念可说是已表现出来了。
今天下不幸有急，而式奋愿父子死之，虽未战，可谓义形于内。
Now the nation unfortunately has a crisis, and Bu Shi courageously requested that he and his father fight for it. Although he did not participate in the battle, his loyalty is revealed in his heart.