《太平广记·卷二百四十九·诙谐五》
赵元楷召呼令狐德棻一块儿去黄河边观看位于河中间急流处的砥柱石，令狐德棻没有去。
元楷召德棻河边观砥柱，德棻不去，遂独行。
Zhao Yuankai called Linghu Defen to go and watch the Dhizhu Stone, which was located in the rapids in the middle of the Yellow River, but Linghu Defen didn't go.