Shiva Purana
तदा शिवः प्रसन्नो भूत्तस्यास्सुतपसो मुने ॥ तद्वृत्तसुपरीक्षार्थं वरं दातुम्मुदा ययौ ॥ ३॥
O sage then Lord Śiva was pleased with her son's austerities He happily went to give her a boon to test her well.
english translation
tadA zivaH prasanno bhUttasyAssutapaso mune ॥ tadvRttasuparIkSArthaM varaM dAtummudA yayau ॥ 3॥
hk transliteration by Sanscript