Shatapatha Brahmana 7.1.1.24

7.1.1.24

agne divo arṇamacā jigāsīti | āpo vā asya divo 'rṇastā eṣa dhūmenācaityacā devāṃ ūciṣe dhiṣṇyā ya iti prāṇā vai devā dhiṣṇyāste hi sarvā dhiya iṣṇanti yā rocane parastātsūryasya yāścāvastādupatiṣṭhanta āpa iti rocano ha nāmaiṣa loko yatraiṣa etattapati tadyāścaitam pareṇāpo yāścāvareṇa tā etadāha

[The third, with Vâg. S. XII, 49] 'O Agni, thou goest up to the flood of the heaven;' the flood of that heaven doubtless is the waters (of the atmosphere): to them he goes by his smoke;--'hither callest thou the divine inspirers,'--the divine inspirers doubtless are the vital airs, for these inspire all thoughts;--'the waters approach (thee), they that are beyond the luminous sphere of the sun, and they that are below here;'--the luminous sphere doubtless is that world yonder where that (sun) is burning: he thereby means both the waters which are beyond, and those which are below that (sun).