Śatapatha Brāhmaṇa ("of a hundred paths") 6.3.3.12

6.3.3.12

athainamunmṛśati | etadvā enaṃ devāḥ procivāṃsaṃ vīryeṇa samārdhayaṃstathaivainamayametatprocivāṃsaṃ vīryeṇa samardhayati dyauste pṛṣṭham pṛthivī sadhasthamātmāntarikṣaṃ samudro yoniritītthamasītthamasītyevaitadāha vikhyāya cakṣuṣā tvamabhitiṣṭha pṛtanyata iti vikhyāya cakṣuṣā tvamabhitiṣṭha sarvānpāpmana ityetannopaspṛśati vajro vā aśvo nenmāyaṃ vajro hinasaditi

He then pulls it up; for the gods now endowed it with vigour (for) having indicated (Agni) to them; and in like manner does this one now endow it with vigour (for) having indicated (Agni) to him. He does so, with [Vâg. S. XI, 20], 'The sky is thy back, the earth thy resting-place, the air thy body, the sea thy womb;'--whereby he says, 'Such thou art, such thou art;'--'Looking about with thine eye, tread down the assailers!'--that is, 'Looking about with thy eye, tread down all evildoers!' He does not touch it, lest this thunderbolt should injure him, for the horse is a thunderbolt.