Śatapatha Brāhmaṇa ("of a hundred paths") 9.5.2.11

9.5.2.11

taddhaike | karmaṇaḥ karmaṇa evaitām pratipadaṃ kurvate 'pahatapāpmāna etatkarma karavāmahā iti purīṣavatīṃ citiṃ kṛtvopatiṣṭhetetyu haika āhustatra hi sā sarvā kṛtsnā bhavatīti sa yathā kāmayeta tathā kuryāditi nu cayanasyāthāto 'cayanasya

Now some make this (hymn) the opening rite of every performance, saying, 'Freed from evil, we must perform this sacred work!' And others, indeed, say, 'Let him approach reverently (each) layer when it is covered with soil, for therein that (layer) becomes whole and complete.' Let him, then, do as he chooses. So much as to the building; now as to the non-building.