Śatapatha Brāhmaṇa ("of a hundred paths") 3.1.2.11

3.1.2.11

sa snāti | āpo asmānmātaraḥ śundhayantviti ghṛtena no ghṛtaṣvaḥ punantviti tadvai sapūtaṃ yaṃ ghṛtenāpunaṃstasmādāha ghṛtena no ghṛtapvaḥ punantviti viśvaṃ hi ripram pravahanti devīriti yadvai viśvaṃ sarvaṃ tadyadamedhyaṃ ripraṃ tatsarvaṃ hyasmādamedhyam pravahanti tasmādāha viśvaṃ hi ripram pravahanti devīriti

He bathes, with the text (Vâg. S. IV, 2; Rig-veda X, 17, 10), 'May the waters, the mothers, cleanse us!' whereby he says, 'May they cleanse!' 'May the purifiers of ghee purify us with (heavenly) ghee!' For he, indeed, is thoroughly purified whom they have purified with ghee: accordingly he says, 'May the purifiers of ghee purify us with ghee!'--'For they, the divine, take away all taint;' now 'all' means 'every,' and 'taint' means what is impure; for they do take away from him every impurity: therefore he says, 'For they, the divine, take away all taint.'