Śatapatha Brāhmaṇa ("of a hundred paths") 4.3.3.9

4.3.3.9

sa hovāca | sahaiva maujasopāvartadhvamiti tebhyo vai nastṛtīyaṃ grahaṃ gṛhāṇeti tebhya etaṃ tṛtīyaṃ grahamagṛhṇādupayāmagṛhīto 'si marutāṃ tvaujasa iti ta enaṃ sahaivaujasopāvartanta tairvyajayata tairvṛtramahankṣatraṃ vā indro viśo maruto viśā vai kṣatriyo balavānbhavati tatkṣatra evaitadbalaṃ dadhāti tasmānmarutvatīyāngṛhṇāti

He said, 'Do ye join me with vigour!'--'Then draw a third cup for us;' they said. He drew a third cup for them, with, 'Thou art taken with a support,--thee for the vigour of the Maruts!' They then joined him with vigour,--and he conquered with them, and smote Vritra with them;--for Indra is the nobility, and the Maruts are the people, and through the people the noble becomes strong. Hence he now bestows that strength on the nobility, and therefore he draws the Marutvatîya cups.