Hmam bin Yahya bin Dinar همام بن يحيى بن دينار · Battles (Kitab Al-Malahim)

The Messenger of Allah (ﷺ) mentioned the Dajjal (Antichrist) saying: If he comes forth while I am among you I shall be the one who will dispute with him on your behalf, but if he comes forth when I am not among you, a man must dispute on his own behalf, and Allah will take my place in looking after every Muslim. Those of you who live up to his time should recite over him the opening verses of Surat…

A similar tradition has been transmitted by Abu Umamah from the prophet (ﷺ) through a different chain of narrators. In this version he mentioned the prayers to the same effect.