Śatapatha Brāhmaṇa ("of a hundred paths") 4.6.2.1

4.6.2.1

etaṃ vā ete gacanti | ṣaḍbhirmāsairya eṣa tapati ye saṃvatsaramāsate taducyata eva sāmato yathaitasya rūpaṃ kriyata ucyata ṛkto 'thaitadeva yajuṣṭaḥ puraścaraṇato yadetaṃ gṛhṇantyeteno evainaṃ gacanti

Verily, they who sit (sacrificing) for a year, by means of six months go to him that burns yonder: so it is told on the part of the Sâman, in as much as it is made of the form of that (sun) it is told on the part of the Rik; and now in like manner on the part of the Yagus, by means of preparatory rite, when they draw that (graha), they thereby also go to him (the sun).