Matsyapurana 12.12

12.12

māsamekaṃ pumānvīraḥ strī ca māsamabhūtpunaḥ
budhasya bhavane tiṣṭhan nilo garbhadharo 'bhavat //

On becoming a Kimpuruṣa, Ila used to remain in the form of a man for one month and the next month he used to become a woman again. Ila, in the form of Ilâ, conceived in the house of Budha, and gave birth to a notable son. Budha, after the birth of that son, went to heaven.—12-13.