Shiva Purana
स्वरूपन्दर्शयामास तस्यै सुप्रीतमानसः ॥ वरम्ब्रूहीति चोवाच तां शिवां शंकरो मुने ॥ ४ ॥
O sage, the delighted Śiva revealed his real form to her and told Pārvatī, “Mention the boon you wish to have.”
english translation
svarUpandarzayAmAsa tasyai suprItamAnasaH ॥ varambrUhIti covAca tAM zivAM zaMkaro mune ॥ 4 ॥
hk transliteration by Sanscript