Śatapatha Brāhmaṇa ("of a hundred paths") 6.3.1.19

6.3.1.19

deva savitaḥ prasuva yajñam prasuva yajñapatim bhagāyeti | asau vā ādityo devaḥ savitā yajño bhagastametadāha prasuva yajñam prasuva yajñapatim bhagāyeti divyo gandharvaḥ ketapūḥ ketaṃ naḥ punātvityasau vā ādityo divyo gandharvo 'nnaṃ keto 'nnapūrannaṃ naḥ punātvityetadvācaspatirvācaṃ naḥ svadatviti vāgvā idaṃ karma prāṇo vācaspatiḥ prāṇo na idaṃ karma svadatvityetat

[Vâg. S. XI, 7] 'God Savitri, speed the sacrifice, speed the lord of sacrifice unto his share!'--the god Savitri is yonder sun, and his share is the sacrifice, that he means to say when he says 'speed the sacrifice, speed the lord of sacrifice!'--'May the heavenly, thought-cleansing Gandharva cleanse our thought!'--the heavenly Gandharva is yonder sun, and thought is (sacrificial) food; thus, 'May the food-cleanser cleanse our food!'--'May the lord of speech render agreeable our speech!'--this sacred rite is speech, and the lord of speech is the breath: thus, 'May the breath render agreeable this rite of ours!!