Ramayana
अप्सु निर्मथनादेव रसात्तस्माद्वरस्त्रियः। उत्पेतुर्मनुजश्रेष्ठ तस्मादप्सरसोऽभवन्॥ १-४५-३३
Oh ! Best among men ( Rama ), excellent women emerged out of the essence produced by churning of waters. Therefore they were known as apsarasas. ॥ 1-45-33॥
english translation
apsu nirmathanAdeva rasAttasmAdvarastriyaH। utpeturmanujazreSTha tasmAdapsaraso'bhavan॥ 1-45-33
hk transliteration by Sanscript