الكفر
Abu Hurayrah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah's peace and blessings be upon him) said: "Two matters are signs of disbelief on the part of those who indulge in them: Defaming a person's lineage and wailing over the dead."
عن أبي هريرة -رضي الله عنه- قال، قال: رسول الله -صلى الله عليه وسلم-: «اثنتان في الناس هما بهم كفر: الطعن في النسب، والنياحة على الميت».
شرح الحديث :
The Prophet (may Allah's peace and blessings be upon him) says that two characteristics of disbelief will persist among people; no one is safe from them except those whom Allah wills to be safe. The first is defaming and speaking ill of someone's lineage and ancestry. The second is raising the voice with wailing and lamenting when afflicted with calamity, out of discontent with fate. These acts represent minor disbelief. Anyone who commits an act of minor disbelief does not get out of the fold of Islam, unless he actually commits major disbelief.