Shatapatha Brahmana 5.1.5.25

5.1.5.25

sa upaspṛśati | ā mā vājasya prasavo jagamyādityannaṃ vai vāja ā mānnasya prasavo jagamyādityevaitadāheme dyāvāpṛthivī viśvarūpe iti dyāvāpṛthivī hi prajāpatirā mā gantām pitarāmātarā ceti māteva ca hi piteva ca prajāpatirā mā somo amṛtatvena gamyāditi somo hi prajāpatiḥ

He then steps over against (the horses) with the Bârhaspatya pap, and touches it; for he who offers the Vâgapeya wins food, since 'vâga-peya' is the same as 'anna-peya:' whatever food he has thus gained that he now, having reached that goal, brings in contact with himself, puts within himself.