Purification (Kitab Al-Taharah)
Dawud :: Book 1 : Hadith 337
Narrated Abdullah ibn Abbas:
A man was injured during the lifetime of the Apostle of Allah (peace_be_upon_him); he then had a sexual dream, and he was advised to wash and he washed himself. Consequently he died. When this was reported to the Apostle of Allah (peace_be_upon_him) he said: They killed him; may Allah kill them! Is not inquiry the cure of ignorance?