Shiva Purana

siva.sh/siva-purana/rudra-samhita/186/37

छिद्रान्वेषी भ्रमन्सोथ विनिकेतो यथानिलः।। सप्तलोकान्सपातालान्रुद्रदेहे व्यलोकयत् ।। ३७ ।।

sanskrit

Then, like the wind, he wandered aimlessly, searching for an opening. He beheld the seven worlds and the netherworlds within Rudra’s body.

english translation

chidrAnveSI bhramansotha viniketo yathAnilaH|| saptalokAnsapAtAlAnrudradehe vyalokayat || 37 ||

hk transliteration by Sanscript