Sayyiduna Hudhayfah (may Allah be pleased with him) narrates: We were present with the Prophet Muhammad (peace and blessings be upon him), and the Prophet (peace and blessings be upon him) mentioned Dajjal and said: Your (mutual discord) is more frightening to me than the trial of Dajjal. Every small and big trial will be a precursor to the trial of Dajjal. Whoever is saved from the trials before it will also be saved from it, and it will not harm any Muslim, because between his two eyes, in letters, "K F R" (i.e., disbeliever) will be written.
Hadith Referenceصحیح ابن حبان / كتاب التاريخ / 6807
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيحسن صحيح - «الصحيحة» (3082).فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح