Śatapatha Brāhmaṇa ("of a hundred paths") 1.2.4.5

1.2.4.5

ādade 'dhvarakṛtaṃ devebhya iti | adhvaro vai yajño yajñakṛtaṃ devebhya ityevaitadāha taṃ savye pāṇau kṛtvā dakṣiṇenābhimṛṣya japati saṃśyatyevainametadyajjapati

'I take (thee) that performs sacred rites to the gods,' he says, because a sacred rite means a sacrifice: 'that performs sacrifices to the gods,' he thereby says. After taking it in his left hand and touching it with his right, he murmurs--by what he murmurs he makes it sharp,--