Shatapatha Brahmana 11.5.9.7

11.5.9.7

upayāmagṛhīto'si agnaye tvā gāyatracandasaṃ gṛhṇāmīti gāyatram prātaḥsavanaṃ tatprātaḥsavanam pravṛhatīndrāya tvā triṣṭupcandasaṃ gṛhṇāmīti traiṣṭubham mādhyandinaṃ savanaṃ tanmādhyandinaṃ savanam pravṛhati viśvebhyastvā devebhyo jagaccandasaṃ gṛhṇāmīti jāgataṃ tṛtīyasavanaṃ tattṛtīyasavanam pravṛhatyanuṣṭupte'bhigara iti yadvā ūrdhvaṃ savanebhyastadānuṣṭubhaṃ tadevaitatpravṛhati tannābhiṣuṇoti vajro vai grāvā vāgadābhyo nedvajreṇa vācaṃ hinasānīti

'Thou art taken with a support: for Agni I take thee, possessed of the Gâyatrî metre!'--the morning-service is of Gâyatrî nature: he thus possesses himself of the morning-service;--'For Indra I take thee, possessed of the Trishtubh metre!'--the midday-service is of Trishtubh nature: he thus possesses himself of the midday-service;--'For the Visve Devâh I take thee, possessed of the Gagatî metre!'--the evening-service is of Gagatî nature: he thus possesses himself of the evening-service;--'The Anushtubh is thy song of praise;'--whatever is subsequent to the (three) services, that is of Anushtubh nature: it is thereof he thus possesses himself. He does not press this (batch of Soma-plants) lest he should injure speech (or, the voice of the sacrifice), for the press-stone is a thunderbolt, and the Adâbhya is speech.