Shiva Purana
तपसस्तेज एवासीद्यथा देवा विसिस्मियुः ॥ पुनश्चैव शिवं याताः प्रत्यूचुस्ते समाहिताः ॥ ४ ॥
The splendour of the penance was such that the gods were surprised. They went to Śiva again and told him sincerely.
english translation
tapasasteja evAsIdyathA devA visismiyuH ॥ punazcaiva zivaM yAtAH pratyUcuste samAhitAH ॥ 4 ॥
hk transliteration by Sanscript