Ramayana
एवं स राजा पुरुषो मासं भूत्वाथ कार्दमिः । त्रैलोक्यसुन्दरी नारी मासमेकमिला ऽभवत् ॥ 7-87-29 ॥
Thus that king, the son of Kardama, having become a man for one month, then for one month became Ila, a woman beautiful beyond all the three worlds.
english translation