Verse 1.1.7

यथोर्णनाभिः सृजते गृह्णते च यथा पृथिव्यामोषधयः संभवन्ति ।
यथा सतः पुरुषात्केशलोमानि तथाऽक्षरात्संभवतीह विश्वम् ॥ ७ ॥

yathorṇanābhiḥ sṛjate gṛhṇate ca yathā pṛthivyāmoṣadhayaḥ saṃbhavanti |
yathā sataḥ puruṣātkeśalomāni tathā'kṣarātsaṃbhavatīha viśvam || 7 ||

7. As the spider creates and absorbs, as medicinal plants grow from the earth, as hairs grow from the living person, so this universe proceeds from the immortal.

Shankara’s Commentary:

Com.—It was said the immortal is the source of all created things. How it is the source is explained by well-known analogies; as is well-known in the world, the spider without requiring any other cause itself creates, i. e., sends out threads not distinct from its own body and again absorbs them itself, i. e., draws them into itself or makes them part of itself; as medicinal plants, i. e., from the corn plant to the immovable, not distinct from the earth, proceed from the earth, and as from the living person the hairs proceed different in nature from him; as in these illustrations, so here, i. e., in the circle of samsara, all the universe of the same and different nature proceeds from the akshara above described, without requiring any other cause; the statement of many analogies is to facilitate easy understanding of the meaning; universe which proceeds from the Brahman proceeds in this order and not all at once, like the throwing of a handful of apples.