“One who destroys Asha, Righteousness … a theological and ritual designation of one who deviates from the prescribed teachings of the established church and who preaches heresy both as regards the doctrines of the faith and the rules of ceremonial. The ashemaogha is generally to be understood as equivalent to the unrighteous. Anyone who undertakes to cleanse a person defiled by the dead, without being well-versed in the Zoroastrian rules of cleanness, is also an ashemaogha.”

Maneckji Nusservanji Dhalla, Ph. D., Litt.D. History of Zoroastrianism, New York, London, Toronto: Oxford University Press, 1938, p. 249.

https://www.avesta.org/dhalla/history4.htm

Ashmogh, — this word is derived from the word ashemaogha, frequently used in the Avesta, which means “hinderer of purity.” Hence, it is applied, among the followers of Zarathushtra to persons who throw obstructions in the way of religion and create dissensions in the community and between individuals. The individual putting the above and other questions is called Ashmogh by the High priest to whom they were addressed.

Peshotun Dustoor Behramjee Sunjana [Sanjana]. The Dinkard, Vol. I. Book 3, Bombay: D. Ardeshir & Co.,, 1874,.

https://www.avesta.org/denkard/dk3s1.htm.

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In Yasht 3: Ardwahisht (Ardibehist) Yasht

7. ‘Sickness fled away [before it], Death fled away; the Daeva fled away, the Daeva’s counter-work fled away; the unholy Ashemaogha fled away, the oppressor of men fled away.

10. ‘He it is who smites me that brood of the Snake, and who might smite those Daevas by thousands of thousands, by ten thousands of ten thousands; he smites sickness, he smites death, he smites the Daevas, he smites the Daeva’s counter-work, he smites the unholy Ashemaogha, he smites the oppressor of men.

14. ‘”He will smite the unholy Ashemaogha, he will afflict the unholy Ashemaogha;
‘”He will smite the most oppressive of the oppressors of men, he will afflict most oppressive of the oppressors of men.

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See also Brunner, Christopher J.. “AHLOMŌG.” Encyclopaedia Iranica. Published December 15, 1984. https://doi.org/10.1163/2330-4804_EIRO_COM_4911