Ahl as-sunna scholars who showed the right path to all Muslims on the earth and guided us to learn the religion of Muhammad (‘alaihi’s-salâm) without any change or interpolation are the scholars of the four Madhhabs who had attained to the grade of ijtihâd. The most prominent ones of them are four. The first of them was al-Imâm al-a’zâm Abû Hanîfa Nu’mân ibn Thâbit (rahimah-Allâhu ta’âlâ). He was one of the greatest ‘ulamâ’ of Islam. He became the leader of Ahl as-Sunna. His biography is written in the Turkish books Seadet-i Ebediyye and Faideli Bilgiler. He was born in Kûfa in 80 A. H.  and was martyred in Baghdad in 150 .
The second one was the great scholar Imam Mâlik ibn Anas (rahimah-Allâhu ta’âlâ). The book Ibni Âbidîn says that he lived eighty-nine years. His grandfather was Mâlik bin Ebî Âmir.
The third one was Imâm Muhammad ibn Idrîs ash-Shâfi’î (rahimah-Allâhu ta’âlâ), who is the apple of the eyes of Islamic scholars. He was born in 150  in Ghazza, Palestine, and passed away in Egypt in 204 .
The fourth one was Imâm Ahmad ibn Hanbal (rahimah-Allâhu ta’âlâ), who was born in Baghdad in 164  and passed away there in 241 . He is the archstone of the Islamic building.
Today, he who does not follow one of these four great imâms is in great danger. He is in heresy. Besides them there were many other Ahl as-sunna scholars who had righteous madhhabs, too. But in the course of time their madhhabs were forgotten and could not be committed to books.