Traced to Ka'b al-Ahbar (automatic guess): a report of earlier scriptures, not a hadith of the Prophet ﷺ.
يحاصر الدجال المؤمنين ببيت المقدس، فيصيبهم جوع شديد، حتى يأكلوا أوتار قسيهم من الجوع، فبينا هم على ذلك إذ سمعوا صوتا في الغلس، فيقولون: إن هذا لصوت رجل شبعان، قال: فينظرون فإذا بعيسى ابن مريم، قال: وتقام الصلاة، فيرجع إمام المسلمين المهدي، فيقول عيسى: تقدم، فلك أقيمت الصلاة، فيصلي بهم ذلك الرجل تلك الصلاة، قال: ثم يكون عيسى إماما بعده
The Dajjal besieges the believers in the Holy House, and they are afflicted with severe hunger, until they eat the strings of their bows from hunger. While they were in that state, they heard a voice in the woods, and they said: This is the voice of a full man. He said: Then they looked and saw Jesus, son of Mary. He said: And the prayer was established, and the Imam of the Muslims, the Mahdi, would return, and Jesus said: Go forward, for you the prayer has been established, and that man would lead that prayer with them. He said: Then Jesus would be an Imam. After him
ضمرةيحيى بن أبي عمرو السيبانيكعبهذا لصوت رجل شبعانautomatic reading, unverified