《史记·三十世家·郑世家》
灵公叫他过去，却唯独没把汤给他喝，子公很生气，手指在汤里沾了一下尝了尝就出了宫。
灵公召之，独弗予羹。子公怒，染其指，尝之而出。
Duke Ling summoned him, but did not offer him the soup to drink, and Zigong was furious, he dipped his fingers in the soup, tasted it and immediately left the court.