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Imam Mahdi (pbuh) in Sunni books
1-Imam Mahdi (AS) in Sihah Sitta[1]
Inevitability of Imam Mahdi’s uprising: It is unanimous by Shia and Sunni People that Imam Mahdi (AS) shall arrive and even non-Muslim people has promised the arrival of one savior at the last age to their followers.
These are some examples:
but with righteousness shall he judge the poor, and decide with equity for the meek of the earth; … And the wolf shall dwell with the lamb, and the leopard shall lie down with the kid; and the calf and the young lion and the fatling together; and a little child shall lead them. … They shall not hurt nor destroy in my entire holy mountain; for the earth shall be full of the knowledge of Jehovah, as the waters cover the sea.[2]
Or In the Old Testament: