The Rigveda mentions the Persians as "Parshavas" and later as "Parasikas," terms from which the modern word "Parsi" is derived.
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Additionally, the term "Arya," meaning "noble," is significant in both ancient Indian and Iranian contexts. In Sanskrit, "Arya" denotes nobility, and this is reflected in the name "Iran," which is related to the Sanskrit "Arya." The ancient Persians also used the name "Arya," and the word survives in "Iran."
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Furthermore, the Avesta, the sacred Zoroastrian text, mentions "HaptaHendu" (land of seven rivers), which corresponds to the Sanskrit "SaptaSindhu," referring to the region of Punjab. This indicates a recognition of the Indian subcontinent in ancient Iranian literature.
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These references highlight the historical and linguistic connections between ancient Indian and Iranian cultures.