Shiva Purana
सुप्रसन्नस्तपस्वीच्छाशमनादयमीश्वरः॥ ब्रह्मचर्य्यस्वरूपोऽभूत्तदाद्भुततरः प्रभुः॥ ८॥
Then the lord assumed the pleasant, self-controlled and wonderful form of a student-ascetic.
english translation
suprasannastapasvIcchAzamanAdayamIzvaraH॥ brahmacaryyasvarUpo'bhUttadAdbhutataraH prabhuH॥ 8॥
hk transliteration by Sanscript