Śatapatha Brāhmaṇa ("of a hundred paths") 3.1.3.22

3.1.3.22

taṃ saptabhiḥ saptabhiḥ pāvayati | citpatirmā punātviti prajāpatirvai citpatiḥ prajāpatirmā punātvityevaitadāha vākpatirmā punātviti prajāpatirvai vākpatiḥ prajāpatirmā punātvityevaitadāha devo mā savitā punātviti tadvai supūtaṃ yaṃ devaḥ savitāpunāttasmādāha devo mā savitā punātvityacidreṇa pavitreṇeti yo vā ayam pavata eṣo 'cidram pavitrametenaitadāha sūryasya raśmibhirityete vai pavitāro yatsūryasya raśmayastasmādāha sūryasya raśmibhiriti

He purifies him with seven (stalks) each time, with the text (Vâg. S. IV, 4), 'May the Lord of thought purify me!' The lord of thought doubtless is Pragâpati: he thereby means to say, 'May Pragâpati purify me!' 'May the lord of speech purify me!' The lord of speech doubtless is Pragâpati: he thereby means to say, 'May Pragâpati purify me!' 'May the divine Savitri purify me,'--for well purified indeed is he whom the divine Savitri has purified; therefore he says, 'May the divine Savitri purify me!'--'with a flawless cleanser;' for that blower (the wind) is indeed a flawless cleanser: 'with that one,' he means to say; 'with the rays of the sun;' for they, the rays of the sun, are indeed purifiers; therefore he says, 'with the rays of the sun.'