Musnad Ahmad 30:2389

Isma'il narrated to us, from Yunus, from al-Hasan, from Abu Hurayrah, that a man came to the Prophet, peace and blessings of Allah be upon him, and said: "So-and-so slept and did not pray anything last night until he reached the morning." He said: "Satan urinated in his ear." Yunus said: And al-Hasan said: "Indeed, his urine, by Allah, is heavy."