Shiva Purana

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तौ निपात्य महादैत्यावकार्यकरणोद्यतौ ॥ ततः परिणतिं यातो लिंगरूपेण कंदुकः॥२७॥

As they had attempted to do an evil action, the ball changed itself into the phallic image.

english translation

tau nipAtya mahAdaityAvakAryakaraNodyatau ॥ tataH pariNatiM yAto liMgarUpeNa kaMdukaH॥27॥

hk transliteration by Sanscript