Śatapatha Brāhmaṇa ("of a hundred paths") 14.1.4.2

14.1.4.2

garbho devānāmiti eṣa vai garbho devānāṃ ya eṣa tapatyeṣa hīdaṃ sarvaṃ gṛhṇātyetenedaṃ sarvaṃ gṛbhītameṣa u pravargyastadetamevaitatprīṇāti tasmādāha garbho devānāmiti

[Vâg. S. XXXVII, 14,] 'The child of the gods,'--the child (garbha) of the gods, in truth, is he that shines yonder, for he holds (grabh) everything here, and by him everything here is held; and the Pravargya also is that (sun): it is him he thus gratifies, and therefore he says, 'The child of the gods.'