Śatapatha Brāhmaṇa ("of a hundred paths") 1.1.2.5

1.1.2.5

sa vā anasa eva gṛhṇīyāt | ano ha vā agre paśceva vā idaṃ yacālaṃ sa yadevāgre tatkaravāṇiti tasmādanasa eva gṛhṇīyāt

It is from the cart that he should take (the rice required for the sacrifice). For at first the cart (is the receptacle of the rice) and afterwards this hall and because he thinks 'what was at first (in the cart, and hence still unimpaired by entering the householder's abode), that I will operate upon;' for that reason let him take (rice) from the cart.