Ramayana
कृत्वा स्त्रीरूपमात्मानमुमेशो गोपतिध्वजः । देव्याः प्रियचिकीर्षुः संस्तस्मिन्पर्वतनिर्झरे ॥ 7-87-12 ॥
Wishing to please the goddess, the lord of Uma, whose banner bears the bull, had made himself into the form of a woman there, in that mountain cascade.
english translation