Evidence of the worship of Išartu includes early Akkadian theophoric names, offering lists from Mari and late religious texts from Uruk.
[5] Paul-Alain Beaulieu notes that both of them show affinity with another deity from this group, Uṣur-amāssu, and presumes the latter's own association with justice was influenced by this.
[4] She was worshiped in Bad-tibira during the reign of Shu-Sin of the Third Dynasty of Ur[7] and appears in an offering list from Mari (ARM 24 263) alongside Mišaru.
[9] A possible reference to her is also present in the Old Babylonian god list from Isin, but the signs are damaged and the name cannot be restored with certainty.
[10] She is one of the deities mentioned in a description of a parade accompanying Ishtar during the akitu celebrations; among other participants are chiefly figures typically associated with this goddess or the city of Uruk, such as Nanaya, Ninsianna, Ninigizibara or Ninmeurur.