al-Tawḥīd is an esteemed work authored by the revered early Shīʿī scholar Shaykh al-Ṣadūq. This work explores an array of theological themes concerning God's nature and the relationship between God and the Creation. Rather than crafting a dialectic theological or Kalām text, Shaykh al-Ṣadūq has uniquely drawn from the Ḥadīths— the reported sayings of the Prophet (s) and the Imams (as)— to grapple with profound subjects such as God's Oneness, the conundrum of free will versus predestination, the nature of the Qurʾān, the nature of God’s attributes and the impact of revelation. This approach underscores the notable, yet often overlooked, role that the Ḥadīths of the Imams have played in shaping early Muslim theology.