Śatapatha Brāhmaṇa ("of a hundred paths") 6.7.2.15

6.7.2.15

viṣṇoḥ kramo 'sīti | viṣṇurhi bhūtvā kramate 'rātīyato hantetyarātīyato hātra hanti jāgataṃ canda āroheti jāgataṃ canda ārohati divamanu vikramasveti divamanu vikramate praharati pādaṃ kramata ūrdhvamagnimudgṛhṇātyūrdhvo hi rohati

'Thou art Vishnu's stride,'--for in the form of Vishnu he strides;--'the slayer of the evil-minded,'--for he now does slay the evil-minded;-- 'Mount the Gagatî metre!'--for the Gagatî metre he does mount;--'stride along the sky!'--along the sky he indeed strides. He stretches his foot forward and strides: he raises the fire (yet further) upwards, for upwards he ascends.