Śatapatha Brāhmaṇa ("of a hundred paths") 3.7.1.32

3.7.1.32

tatho evaiṣa etat | yūpaśakalameva juhoti tadahaiṣa svagākṛto bhavati tatho rakṣāṃsi yajñaṃ nānūtpibante 'yaṃ vai vajra udyata iti sa juhoti divaṃ te dhūmo gacatu svarjyotih pṛthivīm bhasmanāpṛṇa svāheti

And in like manner does he now only offer up that chip of the sacrificial stake; thereby this (sacrificer) is bid good-speed; and thus the Rakshas do not thereafter sip the sacrifice, thinking, 'that surely is a raised thunderbolt!' He offers it with the text (Vâg. S. VI, 21), 'May thy smoke rise up to the sky, thy light to the heavens! fill the earth with ashes, Hail!'