Brihadaranyaka Upanishad 2.1.6

2.1.6

sa hovāca gārgyo ya evāyaṃ vāyau puruṣa etamevāhaṃ brahmopāsa iti sa hovācājātaśatrurmā maitasminsaṃvadiṣṭhā indro vaikuṇṭho'parājitā seneti vā ahametamupāsa iti sa ya etamevamupāste jiṣṇurhāparājiṣṇurbhavatyanyatastyajāyī

Gârgya said: 'The person that is in the wind (and in the breath), that I adore as Brahman.' Agâtasatru said to him: 'No, no! Do not speak to me on this. I adore him as Indra Vaikuntha, as the unconquerable army (of the Maruts).' Whoso adores him thus, becomes victorious, unconquerable, conquering his enemies.