《南史·列传·卷三十四》
皇上又曾经在后堂大集文武官员，参加聚会的人四五百人，元帝想普遍地测试人们的心情，便说： 劝我迁走的袒露出左臂。 
上又曾以后堂大集文武，其预会者四五百人，帝欲遍试人情，曰： 劝吾去者左袒。 
On one occasion, the Emperor gathered all the civil and military officials in the back hall, with four or five hundred people attending the meeting. The Yuan Emperor wanted to test people's moods more generally, so he said: Show your left arm if you advise me to move.   