Śatapatha Brāhmaṇa ("of a hundred paths") 6.3.1.41

6.3.1.41

hasta ādhāya saviteti | haste hyasyāhitā bhavati bibhradabhrimiti bibharti hyenāṃ hiraṇyayīmiti hiraṇmayī hyeṣā yā candomayyagnerjyotirnicāyyetyagnerjyotirdṛṣṭvetyetatpṛthivyā adhyābharaditi pṛthivyai hyenadadhyābharatyānuṣṭubhena candasāṅgirasvaditi tadenāmānuṣṭubhena candasādatte 'tho asyāmānuṣṭubhaṃ cando dadhāti tānyetānyeva candāṃsyeṣābhrirārambhāyaiveyaṃ vaiṇavī kriyate

[Vâg. S. XI, 11] 'Having taken into his hand, Savitri,'--for it has indeed been taken into his (the Adhvaryu's) hand,--'bearing the spade,'--for he indeed bears it,--'the golden,'--for golden indeed is the one that consists of the metres (the Veda);--'beholding Agni's light,'--that is, seeing Agni's light,--'lifted it up from the earth,'--for he indeed lifts it up from the earth;--'by the Anushtubh metre, Aṅgiras-like;'--he thus takes it up by means of the Anushtubh metre, and lays the Anushtubh metre into it: for his undertaking that spade of bamboo is thus made to be those metres.