Śatapatha Brāhmaṇa ("of a hundred paths") 3.8.1.4

3.8.1.4

sa āśrāvyāha | samidhaḥ preṣyeti preṣya preṣyeti caturthecaturthe prayāje samānayamāno daśabhiḥ prayājaiścarati daśa prayājāniṣṭvāha śāsamāharetyasiṃ vai śāsa ityācakṣate

[The Adhvaryu] having called (on the Âgnîdhra) for the Sraushat, he says (to the Maitrâvaruna), 'Prompt (the Hotri to recite to) the kindling-sticks!' Thus he proceeds with ten fore-offerings, saying, 'Prompt...' at each, and pouring the ghee together at every fourth fore-offering. Having performed ten fore-offerings, he says, 'Bring the slayer!' 'Slayer,' namely, the (butcher's) knife is called.