Yesseus Mazareus Yessedekeus
In Sethian Gnostic texts, Yesseus Mazareus Yessedekeus is the personification of the Living Water. He is mentioned in the Nag Hammadi tractates of the Holy Book of the Great Invisible Spirit, Zostrianos, and Apocalypse of Adam.
Etymology
Meyer gives the etymology of the Yesseus Mazareus Yessedekeus as follows.In contrast, Lofts connects Mazareus with Mazzaroth and considers Yessedekeus to be cognate with Sadducee, in turn derived from Yu/Yu and the root צָדַק, . Lofts also propose that the name Yessedekeus is also found in Mandaeism in the form of Yuzaṭaq, an epithet for Manda d-Hayyi.
Parallels in Mandaeism
In Mandaeism, the uthra Piriawis Ziwa is the personification of the heavenly river of living water. Qulasta prayers 13 and 17 mention Piriawis Ziwa and Piriafil Malaka together as uthras.In Mandaean scriptures such as the Ginza Rabba, is mentioned as the personification of the Euphrates, which is considered to be the earthly manifestation of the heavenly yardna or flowing river.