Rig Veda 10.130

yo yajño viśvatas tantubhis tata ekaśataṃ devakarmebhir āyataḥ ime vayanti pitaro ya āyayuḥ pra vayāpa vayety āsate tate

The sacrifice drawn out with threads on every side, stretched by a hundred sacred ministers and one,- This do these Fathers weave who hitherward are come: they sit beside the warp and cry, Weave forth, weave back.

pumāṁ enaṃ tanuta ut kṛṇatti pumān vi tatne adhi nāke asmin ime mayūkhā upa sedur ū sadaḥ sāmāni cakrus tasarāṇy otave

The Man extends it and the Man unbinds it: even to this vault of heaven hath he outspun, it. These pegs are fastened to the seat of worship: they made the Sama-hymns their weaving shuttles.

kāsīt pramā pratimā kiṃ nidānam ājyaṃ kim āsīt paridhiḥ ka āsīt chandaḥ kim āsīt praugaṃ kim ukthaṃ yad devā devam ayajanta viśve

What were the rule, the order and the model? What were the wooden fender and the butter? What were the hymn, the chant, the recitation, when to the God all Deities paid worship?

agner gāyatry abhavat sayugvoṣṇihayā savitā sam babhūva anuṣṭubhā soma ukthair mahasvān bṛhaspater bṛhatī vācam āvat

Closely was Gayatri conjoined with Agni, and closely Savitar combined with Ushnih. Brilliant with Ukthas, Soma joined Anushtup: Brihaspati's voice by Brihati was aided.

virāṇ mitrāvaruṇayor abhiśrīr indrasya triṣṭub iha bhāgo ahnaḥ viśvān devāñ jagaty ā viveśa tena cākﾱpra ṛṣayo manuṣyāḥ

Viraj adhered to Varuna and Mitra: here Trishtup day by day was Indra's portion. Jagati entered all the Gods together: so by this knowledge men were raised to Rishis.

cākﾱpre tena ṛṣayo manuṣyā yajñe jāte pitaro naḥ purāṇe paśyan manye manasā cakṣasā tān ya imaṃ yajñam ayajanta pūrve

So by this knowledge men were raised to Rishis, when ancient sacrifice sprang up, our Fathers. With the mind's eye I think that I behold them who first performed this sacrificial worship.

sahastomāḥ sahachandasa āvṛtaḥ sahapramā ṛṣayaḥ sapta daivyāḥ pūrveṣām panthām anudṛśya dhīrā anvālebhire rathyo na raśmīn

They who were versed in ritual and metre, in hymns and rules, were the Seven Godlike Rishis. Viewing the path of those of old, the sages have taken up the reins like chariot-drivers.