Shiva Purana
वरम्ब्रूहीति चोवाच सुप्रसन्नो महेश्वरः ॥ कश्यपं मुनिशार्दूलं स्वभक्तं भक्तवत्सलः ॥ ११॥
The delighted Śiva who is favourably disposed towards his devotees said to Kaśyapa, the best of his devotees, to ask for the boon.
english translation
varambrUhIti covAca suprasanno mahezvaraH ॥ kazyapaM munizArdUlaM svabhaktaM bhaktavatsalaH ॥ 11॥
hk transliteration by Sanscript