Jaiminīya (Talavakāra) Brāhmaṇa 29.174.p1

29.174.p1

tā etā bhavanti triṣṭubho gāyatravarṇā ahno rūpeṇa samṛddhāḥ
yatra vā ahārūpeṇa samṛddhayanti saṃ tatrardhyate
samasmā ṛdhyate ya evaṃ veda
tadāhuryadgāyatraṃ saptamamahas | traiṣṭubhamaṣṭamaṃ | jāgataṃ navamam | atha
kasmādetadgāyatraṃ sattriṣṭubbhiḥ pratipadyanta iti
sa brūyātsarve hyevaitacchandomāstriṣṭuppratipado bhavantīti
pra svānāso rathā ive
ti pravatīrbhavanti
prāyaṇīyarūpamevaitadupagacchanti
prāyaṇīyaṃ hyetadahaḥ
sūktamanurūpo bhavati paśavo vai sūktam
paśavaśchandomāḥ paśūnāmevāvaruddhyai
atho bhūmā vai paśavaḥ

These are Triṣṭubh [verses] with the characteristic of Gāyatrī, perfected in the form of the day.
Where they perfect the days by form, there success is attained;
success is attained for him who knows thus.
Concerning this they say: "The seventh day belongs to Gāyatrī, the eighth to Triṣṭubh, the ninth to Jagatī. Then why do they begin this Gāyatrī day with Triṣṭubh verses?"
He should reply: "Because all these Chandomas have Triṣṭubh verses as opening strophes."
"Forward, sounding like chariots..."—
these are [verses] containing 'forward' (pra);
it is the form of the introductory rite that they approach thus;
for this day is introductory.
The Chandomas are cattle, for the securing of cattle;
and moreover, cattle are abundance.