Khvarenah remained a living political and literary concept well beyond the Sasanian Empire's fall to Arab Muslim conquest in the seventh century, surviving in transformed, Persianized form as farr in the New Persian literary tradition, most famously throughout Ferdowsi's eleventh century epic the Shahnameh, where kings and heroes are repeatedly described as possessing or losing farr as a marker of their legitimacy and fortune, carrying a specifically Zoroastrian theological concept forward into a poem composed for an Islamic Persian court centuries after Zoroastrianism had ceased to be Iran's dominant religion.
Later Persian and Persianate political culture across the wider Islamic world continued to use farr language to describe royal charisma and legitimacy long after its explicitly Zoroastrian theological content had faded into a more general, culturally inherited vocabulary of kingship, illustrating how a concept can outlive the specific religious system that first articulated it. Zoroastrian communities today, including the Parsi community of India, retain khvarenah as a living theological concept within the tradition's own scripture and liturgy, distinct from its secularized literary afterlife in Persian court poetry.