Śatapatha Brāhmaṇa ("of a hundred paths") 13.8.1.15

13.8.1.15

samūle samūlaṃ hi pitṝṇām vīriṇamiśrametaddhāsyāḥ pitryamanatiriktamatho aghameva tadbaddhṛ karoti

On such (ground) as is filled with roots, for to the Fathers belongs the (sod) filled with roots;--it is (sod) of vîrina (Andropogon muricatus) and other grasses, for thus the Fathers’ share in this (earth) is not excessive; and he also thereby makes (the deceased's) sin to be restricted.