Śatapatha Brāhmaṇa ("of a hundred paths") 13.8.3.2

13.8.3.2

athainannivapati iyam vai pṛthivī pratiṣṭhāsyāmevainametatpratiṣṭhāyām pratiṣṭhāpayati purādityasyodayāttira-iva vai pitarastira-iva rātristira eva tatkaroti yathā kurvato'bhyudiyāttadenamubhayorahorātrayoḥ pratiṣṭhāpayati

He then pours out that (jarful of bones); for this earth is the foundation: on this (earth), as a foundation, he thus establishes him. Before sunrise (he does so), for, in secret, as it were, are the Fathers, and in secret, as it were, is the night;--in secret, indeed, he does this, (but) so that (the sun) should rise over him doing it: on both day and night he thus establishes him.