Aitareyabrahmana 3.13

3.13

Prajāpatir vai yajñaṃ chandāṃsi devebhyo bhāgadheyāni vyabhajat.
sa gāyatrīm evāgnaye Vasubhyaḥ prātaḥsavane 'bhajat,
triṣṭubham Indrāya Rudrebhyo madhyaṃdine,
jagatīṃ Viśvebhyo devebhya ādityebhyas tṛtīyasavane
'thāsya yat svaṃ chanda āsīd anuṣṭup,
tām udantam abhy udauhad achāvākīyām abhi.
sainam abravīd anuṣṭup: tvaṃ nv eva devānām pāpiṣṭho 'si,
yasya te 'haṃ svaṃ chando 'smi,
yām modantam abhy udauhīr achāvākīyām abhiti.
tad ajānāt, sa svaṃ somam āharat,
sa sve some 'gram mukham abhi paryāharad anuṣṭubhaṃ.
tasmād v anuṣṭub agriyā mukhyā yujyate sarveṣāṃ savanānām
agriyo mukhyo bhavati, śreṣṭhatām aśnute ya evaṃ veda
sve vai sa tat some 'kalpayat.
tasmād yatra kva ca yajamānavaśo bhavati, kalpata eva yajño 'pi
tasyai janatāyai kalpate yatraivaṃ vidvān yajamāno vaśī yajate

iii. 13 (xii. 2). Prajāpati assigned to the gods the sacrifice and the metres in portions. He allotted the Gāyatrī at the morning pressing to Agni and the Vasus, the Triṣṭubh to Indra and the Rudras at the midday (pressing), the Jagatī to the All-gods, and the Ādityas at the third pressing. Now, the metre that was his own, the Anuṣṭubh, he pushed out to the end to the office of the Achāvāka; she, the Anuṣṭubh, said to him ‘Assuredly thou art the worst of the gods whose own metre I am and who yet hast pushed me to the end to the office of the Achāvāka.’ This he recognized; he took his own Soma offering; he brought the Anuṣṭubh round to the very beginning in his own Soma offering; therefore the Anuṣṭubh is employed at the very beginning of all the pressings. The very first does he become, pre-eminence doth he attain, who knows thus. He arranged this in his own Soma offering; therefore whenever it falls under the power of the sacrificer the sacrifice is in order; (all) is in order for that people when a sacrificer knowing thus has power.