Śatapatha Brāhmaṇa ("of a hundred paths") 4.2.4.14

4.2.4.14

yadvā asyordhvaṃ nābheḥ | tadasyaita ātmana uparīva vai tadyadūrdhvaṃ nābheruparīvaitadyadupakīrṇaṃ tasmādupakīrṇe sādayatyathaitaṃ vyuhya na tṛṇaṃ canāntardhāya

For those (other cups of Soma) are that part of his body from the navel upwards, and above, as it were, is what is from the navel upwards, and above, as it were, is what is raised: therefore he deposits (the others) on the raised (mound), and this one (he deposits) after pushing (the dust) aside without leaving as much as a blade of grass between.