Shiva Purana
अंडस्यांतर्बहिर्वर्ती रुद्रो लोकद्वयाधिपः ॥ शिवप्रियः शिवासक्तः शिवपादार्चने रतः ॥ १२३ ॥
Lord Śiva, the lord of the two worlds, resides within and without the egg. He is dear to Lord Shiva and attached to Lord Shiva and is engaged in worshiping the feet of Lord Shiva.
english translation
aMDasyAMtarbahirvartI rudro lokadvayAdhipaH ॥ zivapriyaH zivAsaktaH zivapAdArcane rataH ॥ 123 ॥
hk transliteration by Sanscript