Aitareya Āraṇyaka 2.1.1

2.1.1

eṣa panthā.
etat karma-.
-etad brahma-.
-etat satyam \
tasmān na pramādyet.
tan nā/tīyāt \
na hy atyāyan pūrve.
ye 'tyāyaṃs, te parābabhūvuḥ \
tad uktam ṛṣiṇā \
prajā ha tisro atyāyam īyur (RV VIII 101,14a), ny anyā arkam abhito viviśre (RV VIII 101,14b) \ bṛhad dha tasthau bhuvaneṣv antaḥ (RV VIII 101,14c), pavamāno harita ā viveśa- (RV VIII 101,14d) -iti \\
prajā ha tisro atyāyam īyur iti, yā vai tā imā prajās tisro atyāya/m āyaṃs tānīmāni vayāṃsi vaṅgāvagadhāś cerapādāḥ \
ny anyā arkam a/bhito viviśra iti, tā imāḥ prajā arkam abhito niviṣṭā imam evāgnim \
bṛhad dha tasthau bhuvaneṣv antar ity, ada u eva bṛhad bhuvane/ṣv antar asāv ādityaḥ \
pavamāno harita ā viveśeti, vāyur eva pavamāno diśo harita āviṣṭaḥ \\ 1 \\

Let no man swerve from it, let no man transgress it.

For the old (sages) did not transgress it, and those who did transgress, became lost.

This has been declared by a Rishi (Rv. VIII, 101, 14): 'Three (classes of) people transgressed, others settled down round about the venerable (Agni, fire); the great (sun) stood in the midst of the worlds, the blowing (Vâyu, air) entered the Harits (the dawns, or the ends of the earth).'

When he says: 'Three (classes of) people transgressed,' the three (classes of) people who transgressed are what we see here (on earth, born again) as birds, trees, herbs, and serpents.

When he says: 'Others settled down round about the venerable,' he means those who now sit down to worship Agni (fire).

When he says: 'The great stood in the midst of the worlds,' the great one in the midst of the world is meant for this Âditya, the sun.

When he says: 'The blowing entered the Harits,' he means that Vâyu, the air, the purifier, entered all the corners of the earth.