Shatapatha Brahmana 2.2.4.10

2.2.4.10

sa hutvā nyamṛṣṭa | tato vikaṅkataḥ samabhavattasmādeṣa yajñiyo yajñapātrīyo vṛkṣastata ete devānāṃ vīrā ajāyantāgniryo 'yaṃ pavate sūryaḥ sa yo haivametāndevānāṃ vīrānvedāhāsya vīro jāyate

Having offered, he rubbed (his hands). Thence a Vikaṅkata tree sprung forth; and therefore that tree is suitable for the sacrifice, and proper for sacrificial vessels. Thereupon those (three) heroes among the gods were born, viz. Agni, that blower (Vâyu), and Sûrya: and, verily, whosoever thus knows those heroes among the gods, to him a hero is born.