Śatapatha Brāhmaṇa ("of a hundred paths") 11.6.1.12

11.6.1.12

atha ye ete striyāvadrākṣīḥ kalyāṇīṃ cātikalyāṇīṃ ca sā yā kalyāṇī sā śraddhā sa yatpūrvāmāhutiṃ juhoti tena śraddhāmavarunddhe tena śraddhāṃ jayatyatha yātikalyāṇī sāśraddhā sa yaduttarāmāhutiṃ juhoti tenāśraddhāmavarunddhe tenāśraddhāṃ jayati

‘And as to those two women whom thou sawest, one beautiful and one over-beautiful,--the beautiful one is Belief: when one offers the first libation (of the Agnihotra) he subdues Belief, and conquers Belief; and the over-beautiful one is Unbelief: when one offers the second libation, he subdues Unbelief, and conquers Unbelief.