Shatapatha Brahmana 6.4.1.11

6.4.1.11

saṃvasāthāṃ svarvidā | samīcī urasā tmaneti saṃvasāthāmenaṃ svarvidā samīcī urasā cātmanā cetyetadagnimantarbhariṣyantī jyotiṣmantamajasramidityasau vā āditya eṣo 'gniḥ sa eṣa jyotiṣmānajasrastamete antarā bibhṛtastasmādāha jyotiṣmantamajasramiditi

[Vâg. S. XI, 31] 'Guard ye, light-finders, uniting with each other, with the breast, with the self,'--that is, 'guard him, ye light-finders, uniting with each other, both with your breast and your self;'--'bearing within the brilliant, the everlasting;'--this Agni indeed is yonder sun, and he is the brilliant, the everlasting one; and him these two bear between (them): hence he says, the brilliant, the everlasting.'