Yusuf bin Mehran (may Allah have mercy on him) says that once a man from Kufa was sitting with Sayyiduna Ibn Umar (may Allah be pleased with them both). He began to speak about Mukhtar al-Thaqafi. Sayyiduna Ibn Umar (may Allah be pleased with them both) said: If what you are saying is true, then I heard the Prophet (peace and blessings be upon him) say that before the Day of Judgment, thirty Dajjal and great liars will appear.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 5985
Hadith Gradingحکم دارالسلام:صحيح لغيره، وهذا إسناد ضعيف لضعف علي بن زيد.