Shatapatha Brahmana 4.5.1.4

4.5.1.4

so 'gnimeva prathamaṃ yajati | atha somamatha savitāramatha pathyāṃ svastimathāditiṃ vāgvai pathyā svastiriyamaditirasyāmeva taddevā vācam pratyaṣṭhāpayantseyaṃ vāgasyām pratiṣṭhitā vadati

To Agni he offers first, then to Soma, then to Savitri, then to Pathyâ Svasti, then to Aditi, Now Pathyâ Svasti (the wishing of a 'happy journey') is speech, and Aditi is this (earth): on her the gods thereby established speech, and thus established thereon speech speaks here.