A mujaddid (Arabic: مجدد) is an Islamic term for one who brings "renewal" (تجديد, tajdid) to the religion.
[3] The concept is based on a hadith (a saying of Islamic prophet Muhammad),[4] recorded by Abu Dawood, narrated by Abu Hurairah who mentioned that Muhammad said: Allah will raise for this community at the end of every 100 years the one who will renovate its religion for it.Ikhtilaf (disagreements) exist among different hadith viewers.
Scholars such as Al-Dhahabi and Ibn Hajar al-Asqalani have interpreted that the term mujaddid can also be understood as plural, thus referring to a group of people.
[6][7] Mujaddids can include prominent scholars, pious rulers and military commanders.
[2] While there is no formal mechanism for designating a mujaddid in Sunni Islam, there is often a popular consensus.