The Messenger of Allah ﷺ said, "People will come forth from the East and pave the way for the Mahdi," meaning his rule.
حدثنا حرملة بن يحيى المصري وإبراهيم بن سعيد الجوهري قالا حدثنا أبو صالح عبد الغفار بن داود الحراني حدثنا ابن لهيعة عن أبي زرعة عمرو بن جابر الحضرمي
قال رسول الله ﷺ يخرج ناس من المشرق فيوطئون للمهدي يعني سلطانه
No references are available.
Its chain of transmission is daif. Busiri graded it daif due to the weakness of Amr bin Jabir. Ibn Lahia was mentioned earlier, no. 330. It has a daif corroborating narration in Abu Naeem's Hilyah, 6/53.