It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Indeed, Islam began as something strange, and it will soon become strange again just as it began, so glad tidings to the strangers." They said: O Messenger of Allah, who are they (the strangers)? He (peace and blessings be upon him) said: "Those who set things right when people become corrupt."
Hadith Referenceالمعجم الأوسط / باب العين / 4915
Hadith Takhrij«أخرجه الطحاوي فى «شرح مشكل الآثار» برقم: 689، والطبراني فى «الأوسط» برقم: 8716، 8977»