"Indeed, Allāh will send for this nation at the head of every hundred years someone who will renew its religion for it." This was recorded by Abū Dāwūd (4291), Abū ʿAmr al-Dānī in "al-Fitan" (45/1), al-Ḥākim (4/522), al-Bayhaqī in "Maʿrifat al-Sunan wa-al-Āthār" (p. 52), al-Khaṭīb in "al-Tārīkh" (2/61), and al-Harawī in "Dhamm al-Kalām" (f. 111/2) through various chains from Ibn Wahb: Saʿīd ibn Abī Ayyūb informed me from Shurāḥīl ibn Yazīd al-Maʿāfirī from Abū ʿAlqamah from Abū Hurayrah from the Messenger of Allāh (ṣallá Allāhu ʿalayhi wa-sallam), who said: and he mentioned it. I said: Al-Ḥākim and al-Dhahabī remained silent about it, but al-Munāwī reported that he authenticated it, so perhaps it was omitted from the printed version of "al-Mustadrak," and the chain is authentic, its men are trustworthy, the men of Muslim. It appeared with al-Ḥākim and al-Harawī instead of "Shurāḥīl": "Sharḥabīl," and I do not consider it preserved, and al-Ḥāfiẓ indicated this in the biography of "Sharḥabīl ibn Sharīk" from "al-Tahdhīb." And Allāh knows best. The ḥadīth is not invalidated by Abū Dāwūd's statement following it: "ʿAbd al-Raḥmān ibn Sharīḥ al-Iskandarānī narrated it, but Shurāḥīl did not transmit it." This is because Saʿīd ibn Abī Ayyūb is a reliable and established authority as in "al-Taqrīb," and he connected and transmitted it, so it is an addition from a trustworthy source that must be accepted.