Shatapatha Brahmana 1.6.1.19

1.6.1.19

saṃvatsaraṃ ha vai prayājairjayañjayati | sa ha nvevainaṃ jayati yo 'sya dvārāṇi veda kiṃ hi sa tairgṛhaiḥ kuryādyānantarato na vyavavidyādyathāsya te bhavanti tasya vasanta eva dvāraṃ hemanto dvāraṃ taṃ vā etaṃ saṃvatsaraṃ svargaṃ lokam prapadyate sarvaṃ vai saṃvatsaraḥ sarvaṃ vā akṣayyametena hāsyākṣayyaṃ sukṛtam bhavatyakṣayyo lokaḥ

He who gains by means of the fore-offerings, assuredly, gains the year. But he alone gains it who knows its doors; for what were he to do with a house who cannot find his way inside? Even as those (fore-offerings) are (the doors) of this (sacrifice), so is the spring a door, and so is the winter a door, of that (year). This same year he enters, as the world of heaven; for, assuredly, the year is all, and the All (universe) is imperishable: his thereby becomes imperishable merit, the imperishable world.