《山海经·海经·海内经》
这地方有一位神，长着人一样的脑袋，蛇一样的身子，身长如车辕，左右两侧各有一个脑袋，穿着紫色的衣服，戴着用毡做成的帽子，名叫延维，一个国家的国君若能得到并祭祀他，就能称霸天下。
有神焉，人首蛇身，长如辕，左右有首，衣紫衣，冠旃冠，名曰延维，人主得而飨食之，伯天下。
In this place there is a god, who has a human-like head and a serpent-like body that is as long as a carriage. On each side of its body there is a head. It wears purple clothing and a hat made of felt. Its name is Yanwei. If a king of a country can obtain and worship it, he would be able to conquer the world.