《新唐书·列传·卷八十八》
公绰曾经贮藏一筐杯盂，封记与原来一样，但器皿都丢失了，奴仆七扯八拉的搪塞，公权笑着说： 银杯自己长翅飞了。 
尝贮杯盂一笥，縢识如故而器皆亡，奴妄言叵测者，公权笑曰： 银杯羽化矣！ 
Gong Chong once stored a basket of cups and bowls, and the sealed records were the same as before, but the utensils were all lost. The servant evasively prevaricated. Gong Quan smiled and said: The silver cup flew away with its own wings.