Garudapurana 1.16.3

1.16.3

akṣaraṃ sarvagaṃ nityaṃ mahabdrahmāsti kevalam /
sarvasya jagato mūlaṃ sarvagaṃ parameśavaram //

imperishable, omnipresent, eternal; it is solely the great Brahman,
the root of the entire world, omnipresent, the Supreme Lord;