Etymologically, Avestan amərətāt derives from an Indo-Iranian root and is linguistically related to Vedic Sanskrit amṛtatva.
Addressing Ahura Mazda in Yasna 34.11, the prophet Zoroaster exclaims that "both Wholeness and Immortality are for sustenance" in the Kingdom of God.
The Younger Avestan texts allude to their respective guardianships of plant life and water (comparable with the Gathic allusion to sustenence), but these identifications are only properly developed in later tradition (see below).
Throughout Zoroastrian scripture and tradition, these three principles are most consistently identified with the creations that they represent: respectively plant life, water, and earth.
According to the cosmological legends of the Bundahishn, when Angra Mainyu (MP: Ahriman) withered the primordial plant, Ameretat crushed it to pulp and mixed it with water.
In the calendrical dedication of Siroza 1.7, Ameretat is invoked on the seventh day of each month together with the Gaokarena (the "White Haoma").
This Younger Avestan allusion to immortality is properly developed in Bundahishn 27.2, where White Haoma is considered to be the "death-dispelling chief of plants."
According to the Denkard's recollection of lost Avestan texts, Zoroaster's tan-gohr, his material self, was under the protection of Ameretat and Haurvatat up until the prophet's conception.
[citation needed] According to Islam tradition, Al-Quran mentions two entities sent to Babil (Babylon) named Harut and Marut, to test people faith because they teach witchcraft and sorcery.