《水经注·卷一》
太子生时，龙王在两边夹住太子，喷水给太子沐浴，一条龙喷的水暖，另一条喷的水冷，就变成了两口水池，直到今天还是一冷一暖。
太子始生时，以龙王夹太子左右，吐水浴太子，见一龙吐水暖，一龙吐水冷，遂成二池。今尚一冷一暖矣。
When the prince was born, the dragon kings held the prince between them on both sides and sprayed water to bathe the prince; one dragon sprayed warm water, and the other sprayed cold water, which turned into two pools, which remain cold and warm to this day.