Śatapatha Brāhmaṇa ("of a hundred paths") 7.3.1.30

7.3.1.30

pāvakavarcāḥ śukravarcā iti | pavakavarcā hyeṣa śukravarcā anūnavarcā udiyarṣi bhānunetyanūnavarcā uddīpyase bhānunetyetatputro mātarā vicarannupāvasīti putro hyeṣa mātarā vicarannupāvati pṛṇakṣi rodasī ubhe itīme vai dyāvāpṛthivī rodasī te eṣa ubhe pṛṇakti dhūmenāmūṃ vṛṣṭyemām

'Pure-flamed, bright-flamed,' for pure-flamed and bright-flamed he (Agni) is; 'full-flamed, didst thou burst forth with light,' that is, 'full-flamed shonest thou forth with light;'--'running about as their son thou helpest the two mothers,' for as their son he does help the two mothers;--'thou fillest both spheres,' the two spheres doubtless are these two, heaven and earth, and these two he indeed fills,--with smoke yonder (sky), with rain this (earth).