[8] The earliest attestation of Napirisha is in a tablet likely dating to the early Sukkalmah dynasty, where an oath was taken in the name of the god.
[9] However, if the dating of some of the newly translated Linear Elamite inscriptions are accurate, then the earliest attestation of Napirisha is during the Shimashki dynasty, during the reign of Kindattu.
[27] Grillot-Susini believes that Inshushinak assimilated some of Napirisha's traits due to political and religious reasons, but points out that they remained as separate deities,[28] and De Graef also stresses that even if they appear together so much that their iconography and characteristics have meshed together, it does not mean they are the same god.
[32] In the Underworld Vision of an Assyrian Prince, Napirisha, along with Humban and Jabru, appear together and are named as protectors of the ghost.
[33] A temple to Napirisha, Kiririsha and the Bahahutep is attested at Tol-e Peytul (Liyan) in the Middle Elamite period.
[5] The name of a temple constructed by Hutelutush-Inshushinak at Anshan and dedicated to Napirisha, Kiririsha, Inshushinak and Simut was translated as the "temple of alliance" by M. Lambert, which de Miroschedji interpreted as representing the union of the regions of Elam, that being Susa, Anshan and Simut as Elam.
[8] Additionally, the high temple at Chogha Zanbil was dedicated jointly to Napirisha and Inshushinak, even though several inscriptions appear to refer to both of the gods as singular.
[35] He appears a total of 26 times, and Henkelman suggests that his popularity within the Fortification Archives may be due to his origin from the highlands.
[36] However, such a suggestion relies on a cultural dichotomy or exclusion between the Persians and the Elamites, which had been challenged in more recent scholarship.