Aitareyabrahmana 6.17: adhyāya 29, khaṇḍaḥ 1-10

6.17

yaḥ śvaḥstotriyas, tam anurūpaṃ kurvanti prātaḥsavane 'hīnasaṃtatyai
yathā vā ekāhaḥ suta, evam ahīnas.
tad yathaikāhasya sutasya savanāni saṃtiṣṭhamānāni yanty,
evam evāhīnasyāhāni saṃtiṣṭhamānāni yanti.
tad yac chvaḥstotriyam anurūpaṃ kurvanti prātaḥsavane 'hīnasaṃtatyā,
ahīnam eva tat saṃtanvanti
te vai devāś ca ṛṣayaś cādriyanta:
samānena yajñaṃ saṃtanavāmeti, ta etat samānaṃ yajñasyāpaśyau:
samānān pragāthān samānīḥ pratipadaḥ samānāni sūktāny
okaḥsārī vā Indro.
yatra vā Indraḥ pūrvaṃ gachaty, aiva tatrāparaṃ gachati,
yajñasyaiva sendratāyai

vi. 17 (xxix. 1). The strophe of the next day they make the antistrophe, at the morning pressing for the continuity of the Ahīna (sacrifice). Just as the one day (rite) pressing, so the Ahīna; just as the pressings of the one day (rite) as a pressing keep united, so the days of the Ahīna keep united. In that they make the strophe of the next day the antistrophe at the morning pressing for the continuity of the Ahīna, verily thus they continue the Ahīna. The gods and the seers planned ‘With what is the same, let us continue the sacrifice; they saw this similarity in the sacrifice,

the Pragāthas the same, the beginnings the same, the hymns the same. Indra is a house frequenter; where Indra goes first, then he returns again; verily (it serves) to secure Indra in the sacrifice.