Abu Hurairah (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) said, "Two matters are signs of disbelief on the part of those who indulge in them: Defaming and speaking evil of a person's lineage, and wailing over the dead."[Muslim]. (FR)
App reference (FR): Book 18, Hadith 68 (FR)
Arabic/English book reference (FR): Book 18, Hadith 1578 (FR)