The Ashâb-i kirâm (the companions of the Prophet) and the Tâbi’în-i izâm (people who saw the Ashâb-i kiram) are called Salaf-i sâlihîn. The Ahl-as-Sunna savants who succeeded them and who lived until the end of the four hundredth year of the Hegira are called Halaf-i sâdiqîn. Halaf-i sâdiqîn always followed the Salaf-i sâlihîn in the knowledge pertaining to faith, deeds and heart; they never deviated from the way of the Salaf-i sâlihîn. It appeared to be impossible to see insân-i-kâmils (perfect guides) after the year fourteen hundred, just as was the fact that there had been no mutlaq mujtahids (absolute mujtahids) left after the year four hundred.  Until Doomsday, however, there will be mujaddids ‘rahmatullâhi ta’âlâ ’alaihim ajma’în’, who may not have attained the grades of Awliyâ or mujtahids, on the earth. These mujaddids will spread the books of the mujtahids all over the world and restore the teachings of the Ahl as-Sunna and the right way, which will have been forgotten by people. They will answer the slanders and lies of the people of bid’at (heretics), false men of Tasawwuf, zindîqs, and impostors of science and religion, with whom the entire world will be rife. People who find and read the books of the mujaddids will attain happiness in this world and in the Hereafter. Endless Bliss First Fasicle | Page 283-284