《水经注·卷一》
太子落地后走了七步，两条龙喷水给太子沐浴，于是就变成井池，僧人们都从这里汲水饮用。
太子堕地，行七步，二龙吐水浴太子，遂成井池，众僧所汲养也。
After the prince was born, he walked seven steps, and two dragons sprayed water on him to bathe him, and it turned into a well. The monks all drink water from here.