Shatapatha Brahmana 10.1.1.5

10.1.1.5

tamadhvaryurgraheṇa gṛhṇāti yadgṛhṇāti tasmādgrahastasmiadyajuḥ purastādeti taṃ saṃvatsara āpnuvanti nnudgātā mahāvratena rasaṃ dadhāti sarvāṇi haitāni sāmāni yanmahāvrataṃ tadasmintsarvaiḥ sāmabhī rasaṃ dadhāti tasminhotā mahatokthena rasaṃ dadhāti sarvā haitā ṛco yanmahadukthaṃ tadasmintsarvābhirṛgbhī rasaṃ dadhāti

The Adhvaryu takes (draws) it by means of the Graha (Soma-cup); and inasmuch as he thereby takes (grab) it, it is (called) Graha. The Udgâtri puts the vital fluid into it by means of the (sâman of the) Great Rite (mahâvrata); but, indeed, the (sâman of the) Great Rite is (equivalent to) all these (other) sâmans (hymn-tunes): it is thus by means of all the hymn-tunes that he puts the vital fluid therein. The Hotri puts the vital fluid therein by means of the Great Litany; but, indeed, the Great Litany is the same as all these rik (hymn-verses): it is thus by means of all the hymn-verses that he puts the vital fluid into it (the Soma-cup).