Śatapatha Brāhmaṇa ("of a hundred paths") 6.5.1.9

6.5.1.9

atha prayauti | saṃsṛṣṭāṃ vasubhi rudrairiti saṃsṛṣṭā hyeṣā vasubhiśca bhavati yanmitreṇa tadvasubhiryadrudraistadrudrairdhīraiḥ karmaṇyām mṛdamiti dhīrā hi te karmaṇyo iyam mṛddhastābhyām mṛdvīṃ kṛtvā sinīvālī kṛṇotu tāmiti vāgvai sinīvālī saināṃ hastābhyām mṛdvīṃ kṛtvā karotvityetat

He then kneads it, with(Vâg. S. XI, 55), 'Mixed by the Vasus, the Rudras,'--for this (clay) has indeed been mixed both by the Vasus and the Rudras: by the Vasus, because by Mitra and by the Rudras, because by the Rudras;--'by the wise, the clay suitable for the work;'--for wise those (gods) are, and suitable for the (sacred) work is this clay;--'making it soft with her hands, may Sinîvalî fashion it!'--Sinîvalî doubtless is speech: thus, 'May she, having made it soft with her hands, fashion it!'