Śatapatha Brāhmaṇa ("of a hundred paths") 5.4.4.10

5.4.4.10

brahmannityeva dvitīyamāmantrayate | tvam brahmāsītītaraḥ pratyāha varuṇo 'si satyaujā iti vīryamevāsminnetaddadhāti varuṇameva satyaujasaṃ karoti

'O Brahman!' thus he addresses him the second time. The other answers, 'Thou art Brahman! Thou art Varuna of true power!'--he thereby lays vigour into him, and causes Varuna to be of true power.