Shiva Purana
सृज्यमानाः प्रजाश्चैव नावर्द्धन्त यदा तदा ॥ द्विधा कृत्वात्मनो देहं स्त्री चैव पुरुषोऽभवत्॥ २४ ॥
When the beings created did not increase he dichotomised his body and became man and woman.
english translation
sRjyamAnAH prajAzcaiva nAvarddhanta yadA tadA ॥ dvidhA kRtvAtmano dehaM strI caiva puruSo'bhavat॥ 24 ॥
hk transliteration by Sanscript