Shiva Purana
एतद्दृष्ट्वानसूयं तत्कर्म पातिव्रतं महत् ॥ प्रसन्नोभून्महादेवः पार्थिवादाविराशु वै ॥ ५० ॥
On seeing this performance of Anasūya, a chaste woman, Lord Śiva was delighted and appeared out of his earthern phallic form.
english translation
etaddRSTvAnasUyaM tatkarma pAtivrataM mahat ॥ prasannobhUnmahAdevaH pArthivAdAvirAzu vai ॥ 50 ॥
hk transliteration by Sanscript