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]. (RU)
App reference (RU): Book 18, Hadith 157 (RU)
Arabic/English book reference (RU): Book 18, Hadith 1667 (RU)