It is narrated from Sayyiduna Mihjan bin al-Adra' (may Allah be pleased with him); he said: The Messenger of Allah (peace and blessings be upon him) sent me for a need. Then, as I was coming out along the road of Madinah, he came across me and took my hand. We set off until we climbed Mount Uhud. He turned towards Madinah and said: "Woe to this town! Its inhabitants will leave it when it is at its most prosperous." I said: "O Prophet of Allah, who will eat its fruit?" He (peace and blessings be upon him) said: "The birds and the beasts of prey will eat freely, and the Dajjal will not be able to enter it; whenever he wants to enter it, he will be met at every one of its passes by an angel with a drawn sword." Then he went on until he reached the door of the mosque, and there was a man praying. He (peace and blessings be upon him) said: "Is he saying it sincerely?" I said: "O Messenger of Allah, this is so-and-so; he is the one who prays the most among the people of Madinah." He (peace and blessings be upon him) said: "Do not let him hear it, or you will destroy him."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17837