Abu Hurairah (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "Two things are signs of disbelief on the part of those who indulge in them: Slandering one's lineage and wailing over the dead."[Muslim].
App reference: Book 18, Hadith 157
Arabic/English book reference: Book 18, Hadith 1667