Han Gan of the Tang was skilled at painting horses. While he was leading a quiet life at home, a person suddenly appeared, arriving wearing a black hat and red robe. Gan asked him: “What brings you here?” He replied: “I am an agent of the nether world. I heard that the gentleman is skilled at painting horses, and hoped to be granted one.” Gan erected a painting and burned it. Several days later he went out, and somebody bowed to him in thanks, saying: “Having benefited from the gentleman’s kindness, I have been spared the pain of trudging through hill and water, and you will also receive a reward for this service.” The following day, somebody brought a hundred bolts of white silk, not knowing where it had come from; Gan accepted and used it.
Li Rong 李冗, Du yi zhi 獨異志 (Outstanding Fantastic Stories), 上1.19 (Tale 98):
Li Rong 李冗, Du yi zhi, 獨異志 (Outstanding Fantastic Stories) in Du yi zhi, Xuanshi Zhi 獨異志，宣室志 (Outstanding Fantastic Stories, Stories from the Chamber of Dissemination), edited by Zhang Yongqin 张永钦 and Hou Zhiming 侯志明 (Beijing: Zhonghua shuju, 1983)