Islamic ethics, psychology of the soul, and the inner secrets of worship. Al-Aqidah al-Wasitiyyah & Spiritual Treatises Author: Shaykh al-Islam Ibn Taymiyyah (1263–1328 CE)
Imam Ahmad ibn Shu'ayb al-Nasa'i (829–915 CE).
Spirituality in Islamic literature focuses on the purification of the soul, ethics, and the internal dimensions of ritual practices. Ihya Ulum al-Din (The Revival of the Religious Sciences)