Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.5.22

4.2.5.22

indrasya puroḍāśaḥ | haryordhānāḥ pūṣṇaḥ karambhaḥ sarasvatyai dadhi mitrāvaruṇayoḥ payasyā pañcapadā paṅktiḥ saitayā haviṣpaṅktyānekākinī gāyatrī prātaḥsavanaṃ vahatyetasyā eva paṅkteḥ sampadaḥ kāmāya prātaḥsavana evaiṣā maitrāvaruṇī payasyāvakLptā bhavati netarayoḥ savanayoḥ

To Indra belongs the cake, to the two bay steeds the parched grains (dhânâh), to Pûshan the porridge (karambha), to Sarasvatî the sour curds (dadhi), and to Mitra and Varuna the clotted curds (payasyâ),--the Paṅkti is five-footed--with that paṅkti of oblations, not alone, the Gâyatrî bears the morning libation (to the gods): for the sake of completing that paṅkti, that oblation of clotted curds to Mitra and Varuna is prepared only at the morning libation, and not at the two other libations.