I heard the Messenger of Allah ﷺ say, "Faith began as something strange, and it will return to being strange as it began. So blessed are the strangers on that day, when the people have grown corrupt. By the One in whose hand is the soul of Abu Qasim, faith will retreat between these two mosques just as a snake retreats into its hole."
سمعت رسول الله ﷺ يقول: إن الإيمان بدأ غريبا، وسيعود غريبا كما بدأ، فطوبى يومئذ للغرباء إذا فسد الناس، والذي نفس أبي القاسم بيده ليأرز الإيمان بين هذين المسجدين كما تأرز الحية في جحرها.
Imam Ahmad (1604), Abu Yaala (756), and Bazzar in Bahr Zakhkhar (1119) all narrated it through routes going back to Abdullah bin Wahb, who said, "Abu Sakhr told me, from Abu Hazim, from Ibn Saad, from Saad." Bazzar said, "I think he is Amir." I say, this is indeed as he thought, for it is stated explicitly in Kitab al-Iman by Ibn Manda (424) that he is Amir bin Saad.Its chain is hasan because of Abu Sakhr, who is Humayd bin Ziyad al-Kharrat, and he is "truthful," being one of the narrators found in Muslim. Haythami said in Majma (7/277), "Ahmad, Bazzar, and Abu Yaala narrated it, and the narrators of Ahmad and Abu Yaala are the narrators of the Sahih."The two masjids are the masjid of Makkah and that of Madinah.