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Abu Naṣr Abu Muḥammad ibn Saʿīd (Arabic: أبو نصر أبو محمد بن سعيد), also known as Shaykh Fathi or Al-Fatḥ al-Mawṣilī was one of the early Muslim Sufi saints. He was born in the Kar district of Mosul, hence he had the epithet Al-Mawsili.
He was a notable Hadith scholar as well as an ascetic. Al-Fath al-Mawsili was also a companion of the fellow scholarly ascetic, Bishr ibn al-Harith. He died in 835 and was buried in his hometown, where a shrine was built over his grave.
References
Silvers, Laury (2013-09-01). "al-Fatḥ al-Mawṣilī". Encyclopaedia of Islam, THREE.