Śatapatha Brāhmaṇa ("of a hundred paths") 8.2.4.20

8.2.4.20

pūrvārdhaṃ ca jaghanārdhaṃ cāṇiṣṭhau karoti | yadahāmūścatasrastenainā aṇiṣṭhā atha yadiha hrasiṣṭhānpaśūnupadadhāti teno etā aṇiṣṭhāḥ pūrvārdhaṃ ca tajjaghanārdhaṃ ca paśoraṇiṣṭhau karoti tasmātpūrvārdhaśca jaghanārdhaśca paśoraṇiṣṭhau tasmātpūrvārdhena ca jaghanārdhena ca paśurucca tiṣṭhati saṃ ca viśatyatha lokampṛṇe upadadhātyasyāṃ sraktyāṃ tayorupari bandhuḥ purīṣaṃ nivapati tasyopari bandhuḥ

The fore and hind parts he makes smallest; for inasmuch as those (bricks in front) are only four in number, thereby they are the smallest; and inasmuch as here (at the back) he puts the smallest animals, thereby these are the smallest: he thus makes the fore and hind parts of an animal the smallest, whence the fore and hind parts of an animal are the smallest; and hence the animal rises and sits down by its fore and hind parts. He then lays down two Lokamprinâ (bricks) in that corner: the significance of them (will be explained) further on. He throws loose earth on the layer: the significance of this (will be explained) further on.