Kitāb al-Tawḥīd (Arabic + English)

Kitāb al-Tawḥīd by Shaykh al-Ṣadūq (d. 381 AH) is a foundational Shi'a theological work focusing on the concept of monotheism (Tawḥīd). It compiles hadiths from the Prophet (PBUH) and Ahlulbayt (AS) explaining God's attributes, divine justice, and refuting anthropomorphism, emphasizing a pure and rational understanding of Allah.