Junayd of Baghdad

Junayd of Baghdad (Persian: جُنیدِ بَغدادی; Arabic: الجنيد البغدادي; c. 830–910; AH 298), also known as Abū l-Qāsim al-Junaid, was a Muslim mystic, Sufi teacher, and one of the most renowned early Islamic saints. He was a major figure in the development of Sufi doctrine, laid foundations for much of the subsequent development of Sufism, and occupies a central position in the spiritual lineages of many Sufi orders. He taught in Baghdad throughout his life and was widely revered by his students and disciples and frequently cited by later mystics. Because of his importance in Sufi theology, he was often referred to as the "Sultan".

Junayd studied within the Shāfiʿī school of law in Baghdad and first encountered Sufism through his uncle, Sarīʿ al-Saqaṭī. He was subsequently instructed by al-Muḥāsibī. From both teachers he derived a strong insistence that Sufi experience should remain governed by religious law and orthodox belief and conduct. He consequently distanced himself from the more extreme pronouncements associated with mystics such as al-Ḥallāj, whom he nevertheless influenced, and became known as an advocate of "sober Sufism".

Little of Junayd's own writing survives, apart from fragments collected under the general title Rasāʾil ("Epistles"). He taught that, since all things derive from God as their creator, they ultimately return to and live in God; for the Sufi, this return is anticipated in the state of fanāʾ.

Source: Wikipedia — https://en.wikipedia.org/wiki/Junayd_of_Baghdad