Hayyi Rabbi

In Mandaeism, Hayyi Rabbi or Heyyi Rabbi (Modern Mandaic pronunciation:; Classical Mandaic: , romanized: Hiia Rbia, lit.'The Great Life'), 'The Great Living God', is the supreme God from which all things emanate.

Hayyi Rabbi is also known as the "First Life", since during the creation of the material world, Yushamin emanated from Hayyi Rabbi as the 'Second Life'. According to Qais Al-Saadi,

[T]he principles of the Mandaean doctrine: the belief of the only one great God, Hayyi Rabbi, to whom all absolute properties belong; He created all the worlds, formed the soul through his power, and placed it by means of angels into the human body. So He created Adam and Eve, the first man and woman.

Mandaeans recognize God to be the eternal, creator of all, the one and only in domination, who has no partner. "God is worshiped alone and praised as the Supreme Force of the universe. He presides over all the worlds and all of creation." In Mandaeism, sahduta is the belief in One God (cf. Middle Aramaicשָׂהֲדוּתָא (sāhdutā) "testimony").