Just as from within himself the spider expands thread through his mouth, plays with it for some time and eventually swallows it, similarly, the Supreme Personality of Godhead expands His personal potency from within Himself. Thus, the Lord displays the network of cosmic manifestation, utilizes it according to His purpose and eventually withdraws it completely within Himself.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यथोर्णनाभिर्हृदयादूर्णां सन्तत्य वक्त्रतः । तया विहृत्य भूयस्तां ग्रसत्येवं महेश्वरः
yathorṇanābhirhṛdayādūrṇāṃ santatya vaktrataḥ | tayā vihṛtya bhūyastāṃ grasatyevaṃ maheśvaraḥ
SB 11.9.21