It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "O people of Madinah, remember the Day of Deliverance (Yawm al-Khalas)." He (peace and blessings be upon him) said this three times. The Companions (may Allah be pleased with them) said: "O Messenger of Allah, what is the Day of Deliverance?" He (peace and blessings be upon him) said: "The Dajjal will come until he camps at Dhubab (a place), and there will not remain in Madinah any disbelieving man or disbelieving woman, any polytheist man or polytheist woman, or any hypocrite man or hypocrite woman, except that they will all go out to him. And on that day the believers will be purified and separated (from them); that is the Day of Deliverance."
Hadith Referenceالمعجم الأوسط / باب الحاء / 3515
Hadith Takhrij«أخرجه الطبراني فى «الأوسط» برقم: 2165»