Shiva Purana
इति दत्तवरस्सोऽपि शिवेन परमात्मना ॥ शक्तस्स वै तदा कर्तुं संबभूव न संशयः ॥ ४२॥
Having received the boon form Śiva the supreme soul, Vīrasena became competent to do everything, of course.
english translation
iti dattavarasso'pi zivena paramAtmanA ॥ zaktassa vai tadA kartuM saMbabhUva na saMzayaH ॥ 42॥
hk transliteration by Sanscript