Śatapatha Brāhmaṇa ("of a hundred paths") 7.3.2.2

7.3.2.2

tadagreṇa gārhapatyam | antarvedyuttaraloma prācīnagnīvamupastṛṇāti tadetāṃ citiṃ samavaśamayantyatha prokṣati tadyatprokṣati śuddhamevaitanmedhyaṃ karotyājyena taddhi śuddham medhyamatho anabhyārohāya na hi kiṃ canānyaddhavirājyena prokṣanti tūṣṇīmaniruktaṃ vai tadyattūṣṇīṃ sarvaṃ vā aniruktaṃ sarveṇaivaitacuddham medhyaṃ karotyatho anabhyārohāya na hi kiṃ canānyaddhavistūṣṇīm prokṣanti

He spreads it in front of the Gârhapatya, on the Vedi, with the hairy side upwards, and the neck towards the east: thereon they appease that layer. Now he sprinkles (the bricks);--when he sprinkles, he thereby makes it pure, sacrificially clean;--with clarified butter (he sprinkles), for that is pure, sacrificially clean; and also with the view of its being unsurpassed, for no other sacrificial food is sprinkled with ghee;--silently (he sprinkles), for what is (done) silently is undefined, and the undefined is everything: by means of everything he thus makes it pure, and sacrificially clean; and also with the view of its being unsurpassed, for no other sacrificial food is sprinkled silently.