Mahabharat
शूद्रायां गौतमॊ यत्र महात्मा संशितव्रतः औशीनर्याम अजनयत काक्षीवादीन सुतान ऋषिः ॥ २-१९-५ ॥
'Here, the illustrious Gautama, renowned for his strict vows, fathered Kakshivat and other celebrated sons on Ausinari, the Sudra woman and daughter of Usinara.' ॥ 2-19-5 ॥
english translation
zUdrAyAM gautamò yatra mahAtmA saMzitavrataH auzInaryAma ajanayata kAkSIvAdIna sutAna RSiH ॥ 2-19-5 ॥
hk transliteration by Sanscript