Silsilah as-Sahihah 3636 — Story of Imam Mahdi

Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings of Allah be upon him) said: "The one behind whom Sayyiduna 'Isa ibn Maryam (peace be upon him) will pray will be from us (i.e., from the Ahl al-Bayt)."