Shiva Purana
तपोरतिरकल्माषो धन्वी खड्गी महानृषिः ॥ तामसस्य स्मृता एते दश पुत्रा महाव्रताः ॥ २६॥
He was a great sage who was immaculate in his austerities and wielded a bow and a sword These ten sons of Tamasa are mentioned as great vows.
english translation
taporatirakalmASo dhanvI khaDgI mahAnRSiH ॥ tAmasasya smRtA ete daza putrA mahAvratAH ॥ 26॥
hk transliteration by Sanscript