Aitareyabrahmana 4.31

4.31

Indra indeed as deity carries the second day;
the fifteenfold is the stoma, the bṛhat the sāman, the triṣṭubh the metre.
According to deity, according to stoma, according to sāman, according to metre, he prospers with this,
who knows thus.
What indeed contains neither "e-" nor "pra-", what is standing still, that is the characteristic of the second day;
what contains "upward", what contains "against", what contains "between", what contains "bull", what contains "increasing",
where the deity is stated in the middle pāda, where the intermediate space is referred to,
what belongs to the bṛhat, what belongs to the triṣṭubh, what is [in the] present tense:
these indeed are the characteristics of the second day.
"Agni the messenger we choose" is the ājya [śastra] of the second day;
[the word in the] present tense on the second day is the characteristic of the second day.
"O Vāyu, those which are your thousand[fold]" is the praüga [śastra];
"The Soma is pressed, increasing cosmic order" contains "increasing", on the second day, the characteristic of the second day.
"Of Viśvānara, master of wealth",
"Indra alone is the Soma-drinker" are the introductory and sequel verses of the marutvatīya [śastra];
containing "increasing" and containing "between", on the second day, [this is] the characteristic of the second day.
"O Indra, come nearer hither" is the unchangeable pragātha; "Rise up, O Brahmanaspati" is
the [verse] to Brahmaṇaspati containing "upward", on the second day, the characteristic of the second day.
"Agni the leader", "You, O Soma, through your intentions", "The waters swell" are the unchangeable additional verses.
"Sing the bṛhat to Indra" is the marutvatīya pragātha;
"By which they generated the light, increasing cosmic order"
contains "increasing", on the second day, the characteristic of the second day.
"O Indra, drink this Soma, O Soma-lord" is the hymn;
"In unison with the Rudras, drink your fill like a bull"
contains "bull", on the second day, the characteristic of the second day.
"You indeed we call upon", "For do you come, energetic ones" is the bṛhat-pṛṣṭha [stotra];
pertaining to the bṛhat on the second day, it is the characteristic of the second day.
"What he has won" is the unchangeable additional verse; ["May Indra hear us] both",
"And may he hear us" is the sāman-pragātha;
"Both what is here today and what was yesterday"
pertains to the bṛhat, on the second day, the characteristic of the second day.
"That swift runner, spurred on by the gods" is the unchangeable Tārkṣya hymn.