Shatapatha Brahmana 4.3.3.2

4.3.3.2

sa śukrāmanthinau prathamau gṛhṇāti | śukravaddhyetatsavanamathāgrayaṇaṃ sarveṣu hyeṣa savaneṣu gṛhyate 'tha marutvatīyamathokthyamukthāni hyatrāpi bhavanti

The Sukra and Manthin grahas he draws first, for thereby the Soma feast comes to be supplied with pure Soma (sukra). Thereupon the Âgrayana, for that (cup) is drawn at all (three) feasts. Then the Marutvatîya cup; then the Ukthya, for here also there are songs of praise (Uktha).