《太平广记·卷五十二·神仙五十二》
又玄高高兴兴地拜谢说： 先生真是有道之人，我愿在您左右作差使，那可以吗？ 
又玄喜谢曰： 先生真有道者，某愿为隶于左右，其可乎？ 
Youxuan again cheerfully said: Old Master is indeed a man who has attained the Way, I would do you many favors if I live with you, is that OK?