《后汉书·列传·窦何列传》
后来窦武的母亲死了，埋葬时还未下棺，有条大蛇自林中出来，直到丧地，用头击柩，涕血双流，俯仰盘屈，似哀泣的样子，好一会儿才离去。
后母卒，及葬未窆，有大蛇自榛草而出，径至丧所，以头击柩，涕血皆流，俯仰蛣屈，若哀泣之容，有顷而去。
When Dou Wu's mother died, before her body was put into the coffin, a large snake came out of the forest, arrived at the funeral site, and used its head to knock on the coffin. Tears of blood flowed from its eyes and it crawled around the coffin, looking mournful. It was a long time before it left.