Yahya related to me from Malik from Abu'z Zinad from al-Araj fromAbu Hurayra that the Messenger of Allah, may Allah bless him and granthim peace, said, "The Hour will not come until a man passes by thegrave of another and says, 'If only I were in his place.' " (ES)
USC-MSA web (English) reference: Book 16, Hadith 54 (ES)
Arabic reference (ES): Book 16, Hadith 576 (ES)