Śatapatha Brāhmaṇa ("of a hundred paths") 6.1.2.25

6.1.2.25

atha ha smāha tāṇḍyaḥ | kṣatraṃ vai yajuṣmatya iṣṭakā viśo lokampṛṇā attā vai kṣatriyo 'nnaṃ viḍyatra vā atturanna bhūyo bhavati tadrāṣṭraṃ samṛddham bhavati tadedhate tasmāllokampṛṇā eva bhūyasīrupadadhyādityetadaha tayorvaco 'nyā tvevāta sthitiḥ

But Tândya used to say, 'Surely the bricks possessed of prayers are the nobility, and the space-fillers are the peasants; and the noble is the feeder, and the peasantry the food; and where there is abundant food for the feeder, that realm is indeed prosperous and thrives: let him therefore pile up abundant space-fillers!' Such then was the speech of those two, but the settled practice is different therefrom.