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]. (DE)
App reference (DE): Book 18, Hadith 68 (DE)
Arabic/English book reference (DE): Book 18, Hadith 1578 (DE)