Śatapatha Brāhmaṇa ("of a hundred paths") 1.1.2.6

1.1.2.6

bhūmā vā anaḥ | bhūmā hi vā anastasmādyadā bahu bhavatyanovāhyamabhūdityāhustadbhūmānamevaitadupaiti tasmādanasa eva gṛhṇīyāt

Moreover, the cart represents an abundance; for the cart does indeed represent an abundance: hence, when there is much of anything, people say that there are 'cart-loads' of it. Thus he thereby approaches an abundance, and for this reason he should take from the cart.