Shatapatha Brahmana 8.7.1.12

8.7.1.12

atho ime vai lokā ṛtavyāḥ | imāṃstallokānūrdhvāṃścitibhiścinotyatho kṣatraṃ vā ṛtavyāḥ kṣatraṃ tadūrdhvaṃ citibhiścinotyatho saṃvatsaro vā ṛtavyāḥ saṃvatsaraṃ tadūrdhvaṃ citibhiścinoti tā nānyayā yajuṣmatyeṣṭakayopariṣṭādabhyupadadhyānnetkṣatraṃ viśābhyupadadhānīti

But the seasonal (bricks), indeed, are also these (three) worlds: by the (different) layers he thus builds up these worlds one above the other. And the seasonal (bricks), indeed, are also the nobility: by the (different) layers he thus builds up the nobility above (the peasantry). And the seasonal ones, indeed, are also the year: by the (different) layers he thus builds up the year. Let him not thereafter place over them any other brick with a sacrificial formula, lest he should place the peasantry above the nobility.