The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 2018
Ibn 'Umar reported: When 'Umar was wounded he fainted, and there was a loud lamentation over him. When he regained consciousness he said: Didn't you know that the Messenger of Allah (may peace be upon him) said:" The dead is punished because of the weeping of the living"?