(Insulting Dead People from the Enemies is Disapproved in Islam)
'Ikrima b. Abi Jahl was an arch-enemy of the Prophet (PBUH) and Islam, and so was his father. When the Prophet entered Mecca triumphantly, he gave protection to 'Ikrima, and addressed his companions, saying, "Ikrima comes to you a believer and emigrant. So, do not insult his father. Indeed insulting the dead hurts the living and does not reach the dead. "