Mimamsasutra 42.2.20-2

Also in the cases of consuming honey, being winnowed by fingernails, enclosing-sticks, and the word *irā*, / those duties of the Six-Day Rite and the rest are to be performed by virtue of substitution.

The adaptation of chants has been completed; next is the adaptation of purificatory rites. In the Vājapeya, a mess of wild rice grains is taught in Śruti. There, since there is no means of valid cognition for wild rice grains occupying the place of rice grains, the duties belonging to rice grains, such as sprinkling and pounding, should not be performed on wild rice grains. If this is urged—

It is not so; because the secondary nominal affix expressing modification in ‘*naivāraḥ*’ is a means of valid cognition for its occupying the place of rice grains. Just as rice grains, by means of dehusked rice grains,