al-Muhasabi

Abu Abdullah al-Harith ibn Asad al-Muhasabi (165-243 AH / 781-857 CE) was one of the earliest and most influential Muslim scholars of interior spiritual states and self-examination. Born in Basra, he spent most of his life in Baghdad. His name derives from the Arabic word muhasabah — the practice of examining one's own soul and holding it to account — which was the central practice he taught and wrote about.

Al-Muhasabi studied hadith under Yazid ibn Harun, Sufyan ibn Uyaynah, and other masters of the Sunnah, and was deeply committed to grounding his spiritual teachings in the Quran and the Prophetic tradition. He was also influenced by the theological debates of his era and engaged with questions of faith and divine attributes, taking positions that were sometimes criticized by traditionalists, most notably by Imam Ahmad ibn Hanbal, who reportedly cautioned against his approach to theological speculation.

His most important works are ar-Ri'ayah li-Huquq Allah (The Observance of Allah's Rights), a foundational text in Islamic ethics and spiritual development; al-Wasaya (The Counsels); and Bada' man Anaba ila Allah (The Beginning of the Repentant's Return to Allah). These works focus on the interior dimensions of worship — sincerity, fear, hope, repentance, and self-examination — and laid the groundwork for later systematic Sufi literature.

Al-Muhasabi is credited with being one of the pioneers who systematized the psychological and ethical dimensions of the Islamic spiritual path. His works were later cited by al-Ghazali, who drew on them extensively in his Ihya' Ulum ad-Din. He passed away in Baghdad in 243 AH.