Śatapatha Brāhmaṇa ("of a hundred paths") 1.1.4.10

1.1.4.10

atha musalamādatte | bṛhadgrāvāsi vānaspatya iti bṛhadgrāvā hyeṣa vānaspatyo hyeṣa tadavadadhāti sa idaṃ devebhyo haviḥ śamīṣva suśami śamīṣveti sa idaṃ devebhyo haviḥ saṃskuru sādhusaṃskṛtaṃ saṃskurvityevaitadāha

He now takes the pestle, with the text (Vâg. S. I, 14 b), 'A large, wooden stone art thou!' for it is a large stone, and made of wood, too. He thrusts it down, with the text (Vâg. S. I, 14 c), 'Do thou prepare this oblation for the gods! do thou prepare it thoroughly!' thereby saying, 'Get this oblation ready for the gods! get it quite ready!'