Śatapatha Brāhmaṇa ("of a hundred paths") 14.2.2.29

14.2.2.29

atha prāṅivodaṅṅutkrāmati dharmāsi sudharmetyeṣa vai dharmo ya eṣa tapatyeṣa hīdaṃ sarvaṃ dhārayatyetenedaṃ sarvaṃ dhṛtameṣa u pravargyastadetamevaitatprīṇāti tasmādāha dharmāsi sudharmeti

He steps out towards the north-east with, 'A well-supporting support thou art,'--he who shines yonder is indeed a support, for he supports everything here, and by him everything here is supported; and the Pravargya also is that (sun): thus it is him he thereby, pleases, and therefore he says, 'A well-supporting support thou art.'