Shatapatha Brahmana 6.3.1.13

6.3.1.13

tatvāya savitā dhiya iti | mano vai savitā prāṇā dhiyo 'gnerjyotirnicāyyetyagnerjyotirdṛṣṭvetyetatpṛthivyā adhyābharaditi pṛthivyai hyenadadhyābharati

'Savitri, stretching out the thoughts,'--for Savitri is the mind, and the thoughts are the vital airs;--'gazing reverently at Agni's light,'--that is, having seen Agni's light;--'bore up from the earth;' for upwards from the earth he indeed bears this (offering).