ŚVETĀŚVATARA UPANISHAD · 6.10

यस् तन्तुनाभ इव तन्तुभिः प्रधानजैः स्वभावतः ।
देव एकः स्वम् आवृणोति स नो दधाद् ब्रह्माप्ययम् ॥

yas tantunābha iva tantubhiḥ pradhānajaiḥ svabhāvataḥ ।
deva ekaḥ svam āvṛṇoti sa no dadhād brahmāpyayam ॥

That only god who spontaneously covered himself, like a spider, with threads drawn from the first cause (pradhâna), grant us entrance into Brahman.

F. Max Müller · The Upanishads, Sacred Books of the East 15 (1884)