Shiva Purana
ऋषय ऊचुः ॥ सूतसूत महाभाग कथमत्रीश्वरो हरः ॥ उत्पन्नः परमो दिव्यस्तत्त्वं कथय सुव्रत ॥ ५ ॥
The sages said:— O Sūta, O fortunate Sūta, how was the excessively divine Śiva born as Atrīśvara? O one of excellent rites, please narrate it.
english translation
RSaya UcuH ॥ sUtasUta mahAbhAga kathamatrIzvaro haraH ॥ utpannaH paramo divyastattvaM kathaya suvrata ॥ 5 ॥
hk transliteration by Sanscript