Just then the child inhaled, drawing Mārkaṇḍeya within His body like a mosquito. There the sage found the entire universe arrayed as it had been before its dissolution. Seeing this, Mārkaṇḍeya was most astonished and perplexed.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तावच्छिशोर्वै श्वसितेन भार्गवः सोऽन्तःशरीरं मशको यथाऽऽविशत् । तत्राप्यदो न्यस्तमचष्ट कृत्स्नशो यथा पुरामुह्यदतीव विस्मितः
tāvacchiśorvai śvasitena bhārgavaḥ so'ntaḥśarīraṃ maśako yathā''viśat | tatrāpyado nyastamacaṣṭa kṛtsnaśo yathā purāmuhyadatīva vismitaḥ
SB 12.9.27