Śatapatha Brāhmaṇa ("of a hundred paths") 5.2.5.1

5.2.5.1

āgnāvaiṣṇavamekādaśakapālam puroḍāśaṃ nirvapati | aindrāvaiṣṇavaṃ caruṃ vaiṣṇavaṃ trikapālaṃ vā puroḍāśaṃ caruṃ vā tena triṣaṃyuktena yajate puruṣānetaddevā upāyaṃstatho evaiṣa etatpuruṣānevopaiti

He prepares a cake on eleven potsherds for Agni and Vishnu, a pap for Indra and Vishnu, and either a cake on three potsherds, or a pap, for Vishnu. He performs that Trishamyukta offering. Therewith the gods came by men, and in like manner does this (king) now thereby come by men.