Skandapurana 5.25.38

5.25.38

mauṃjīhomaḥ pramāṇaṃ syānmunivākyena cedbhavet ..
tadetadapi vākyaṃ hi kātyāyanamuneḥ sphuṭam .. 38 ..

The burning on the muñja-grass pyre would be valid if it were the word of a sage; / and this statement here is indeed clearly that of the sage Kātyāyana.”