Bṛhadāraṇyaka Upaniṣad ("Great Forest Teaching") 3.6

3.6.1

atha hainaṃ gārgī vācaknavī papraccha yājñavalkyeti hovāca yadidam̐ sarvamapsvotaṃ ca protaṃ ca kasminnu khalvāpa otāśca protāśceti vāyau gārgīti kasminnu khalu vāyurotaśca protaścetyantarikṣalokeṣu gārgīti kasminnu khalvantarikṣalokā otāśca protāśceti gandharvalokeṣu gārgīti kasminnu khalu gandharvalokā otāśca protāśceti ādityalokeṣu gārgīti kasminnu khalvādityalokā otāśca protāśceti candralokeṣu gārgīti kasminnu khalu candralokā otāścaprotāśceti nakṣatralokeṣu gārgīti kasminnu khalu nakṣatralokā otāśca protāśceti devalokeṣu gārgīti kasminnu khalu devalokā otāśca protāścetīndralokeṣu gārgīti kasminnu khalvindralokā otāśca protāśceti prajāpatilokeṣugārgīti kasminnu khalu prajāpatilokā otāśca protāśceti brahmalokeṣu gārgīti kasminnu khalu brahmalokā otāśca protāśceti sa hovāca gārgi mātiprākṣīrmāte mūrdhā vyapaptadanatipraśnyāṃ vai devatāmatipṛcchasi gārgi mātiprākṣīriti tato ha gārgī vācaknavyupararāma

Then Gârgî Vâkaknavî asked. 'Yâgñavalkya,' she said, 'everything here is woven, like warp and woof, in water. What then is that in which water is woven, like warp and woof?'
'In air, O Gârgî,' he replied.
'In what then is air woven, like warp and woof?'
'In the worlds of the sky, O Gârgî, 'he replied.
'In what then are the worlds of the sky woven, like warp and woof?'
'In the worlds of the Gandharvas, O Gârgî,' he replied.
'In what then are the worlds of the Gandharvas woven, like warp and woof?'
'In the worlds of Âditya (sun), O Gârgî,' he replied.
'In what then are the worlds of Âditya (sun) woven, like warp and woof?'
'In the worlds of Kandra (moon), O Gârgî,' he replied.
'In what then are the worlds of Kandra (moon) woven, like warp and woof?'
, In the worlds of the Nakshatras (stars), O Gârgî,' he replied.
'In what then are the worlds of the Nakshatras (stars) woven, like warp and woof?'
'In the worlds of the Devas (gods), O Gârgî,' he replied.
'In what then are the worlds of the Devas (gods) woven, like warp and woof?'
'In the worlds of Indra, O Gârgî,' he replied.
'In what then are the worlds of Indra woven, like warp and woof?'
'In the worlds of Pragâpati, O Gârgî,' he replied.
'In what then are the worlds of Pragâpati woven, like warp and woof?'
'In the worlds of Brahman, O Gârgî,' he replied.
'In what then are the worlds of Brahman woven, like warp and woof?'
Yâgñavalkya said: 'O Gârgî, Do not ask too much, lest thy head should fall off. Thou askest too much about a deity about which we are not to ask too much. Do not ask too much, O Gârgî.' After that Gargî Vâkaknavî held her peace.

3.6.1.p1

iti tṛtīyādhyāye ṣaṣṭhaṃ brāhmaṇam