The Law Code of Yājñavalkya 3.1.28

3.1.28

supiṣṭair jalasaṃmiśrair dagdhavyaś ca tathāgninā |
asau svargāya lokāya svāhety uktvā sa bāndhavaiḥ ||
evaṃ parṇaśaraṃ dagdhvā trirātram aśucir bhavet ||

"And he is to be burned with fire [in an effigy made] of well-ground [barley flour] mixed with water,
his relatives having said, 'Svāhā to this person for the heavenly world.'
Having thus burned the effigy of leaves and grass, one remains impure for three nights,"