Sayyiduna Ali (may Allah be pleased with him) narrates that the Prophet (peace and blessings be upon him) said: "The worst of people will be those upon whom the Hour is established while they are alive, those who take graves as places of prostration, and those who give testimony before it is asked of them."
Al-Bazzar recorded it. Its chain contains al-Harith bin Abdullah al-A'war, who is extremely da'if (weak); Yahya bin Ma'in declared him thiqah (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الفتن - أعاذنا الله منها / 12607