It is narrated from Sayyiduna Mihjan bin al-Adra' (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) addressed the people and said three times: "The Day of Deliverance, and what is the Day of Deliverance?" It was said: O Messenger of Allah! What is meant by the Day of Deliverance? He (peace and blessings be upon him) said: "The Dajjal will come and climb Mount Uhud, then he will look down towards Madinah and say to his companions: Do you see this white palace? This is the mosque of Ahmad (peace and blessings be upon him). Then he will advance towards Madinah, and at each of its routes there will be an angel with a drawn sword standing guard. So he will pitch his camp in the salt marsh of al-Juruf. Then Madinah will be shaken by three tremors, as a result of which every hypocrite man and woman and every sinful man and woman will go out to the Dajjal. Thus Madinah will be purified (of the wicked), and that is the Day of Deliverance." This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.