Aitareyabrahmana 4.15: adhyāya 18, khaṇḍaḥ 1-8

4.15

jyotir gaur āyur iti stomebhir yanty.
ayaṃ vai loko jyotir, antarikṣaṃ gaur, asau loka āyuḥ
sa evaiṣa uttaras tryaho
jyotir gaur āyur iti trīṇy ahāni, gaur āyur jyotir iti trīṇy
ayaṃ vai loko jyotir asau loko jyotis,
te ete jyotiṣī ubhayataḥ saṃlokete
tenaitenobhayatojyotiṣā ṣaḷahena yanti.
tad yad etenobhayatojyotiṣā ṣaḷahena yanty,
anayor eva tal lokayor ubhayataḥ pratitiṣṭhanto yanty,
asmiṃś ca loke 'muṣmiṃś cobhayoḥ
pariyad vā etad devacakraṃ yad abhiplavaḥ ṣaḷahas.
tasya yāv abhito 'gniṣṭomau tau pradhī,
ye catvāro madhya ukthyās tan nabhyaṃ
gachati vai vartamānena yatra kāmayate,
tat svasti saṃvatsarasya pāram aśnute ya evaṃ veda
yo vai tad veda yat prathamaḥ ṣaḷahaḥ sa vai
svasti saṃvatsarasya pāram aśnute, yas tad veda yad dvitīyo,
yas tad veda yat tṛtīyo, yas tad veda yac caturtho,
yas tad veda yat pañcamaḥ

iv. 15 (xviii. 1). They proceed with the Stomas, Jyotis, Go, and Āyus; the Jyotis is this world, the Go the atmosphere, the Āyus yonder world. There is the same second set of three days; there are three days, Jyotis, Go, and Āyus; there are three, Go, Āyus, and Jyotis. The Jyotis is this world, the Jyotis is yonder world. These two Jyotis (days) look together on both sides; thereby they proceed with this set of six days with a Jyotis on either side. In that they proceed with this set of six days with a Jyotis on either side, verily thus they continue to find support on both sides in these two worlds; in this world and in that world, both. The Abhiplava Saḍaha is a circling wheel of the gods. The Agniṣṭomas on the two sides of it are the felloes; the four Ukthyas in the middle are the nave. He goes with it turning wherever he desires; thus in safety he attains the other side of the year who knows thus. He, who knows the first set of six days, in safety attains the other side of the year; (so) he who knows the second, he who knows the third, he who knows the fourth, he who knows the fifth.