Shatapatha Brahmana 8.5.1.4

8.5.1.4

te cetayamānāḥ | etā iṣṭakā apaśyannasapatnāstā upādadhata tābhiretaṃ lokamasapatnamanupabādhamakurvata tadyadetābhirimaṃ lokamasapatnamanupabādhamakurvata tasmādetā asapatnāstathevaitadyajamāno yadetā upadadhātamevaitallokamasapatnamanupabādhaṃ kurute sarvata upadadhāti sarvata evaitadetaṃ lokamasapatnamanupabādhaṃ kurute parārdha upadadhāti sarvamevaitadetaṃ lokamasapatnamanupavādhaṃ kurute

Whilst meditating, they saw these Asapatnâ ('foeless') bricks; they laid them down, and by means of them they made that world foeless, undisturbed; and because by means of them they made that world foeless, undisturbed, these (are called) Asapatnâs. And in like manner does the Sacrificer, by laying them down, now make that world foeless, undisturbed. On all (four) sides he lays them down: on all sides he thus makes that world foeless, undisturbed. He places them on the other side: he thereby makes that whole world foe-less, undisturbed.