The Tawḥīd al-Mufaḍḍal (توحيد المفضل, 'Declaration by al-Mufaddal of the Oneness of God'), also known as the Kitāb fī badʾ al-khalq wa-l-ḥathth ʿalā al-iʿtibār ('Book on the Beginning of Creation and the Incitement to Contemplation'), is a ninth-century treatise concerned with proving the existence of God, attributed to the early Shi'i Muslim leader al-Mufaddal ibn Umar al-Ju'fi (died before 799). The work presents itself as a dialogue between al-Mufaddal and the Shi'i Imam Ja'far al-Sadiq (c. 700–765), who is the main speaker.