Hadith 860
Sayyiduna Sahl bin Sa’d Sa’idi (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: “Islam began in a strange state and it will soon return to the same state as it began, so glad tidings for the strangers.” The companions asked: O Messenger of Allah! Who are the strangers? He (peace and blessings be upon him) said: “Those who set things right when people become corrupt.”