Śatapatha Brāhmaṇa ("of a hundred paths") 1.4.3.18

1.4.3.18

yadyaṣṭamyām ... yānmadhyaṃ vā etatprāṇamātmano 'gnāvādhā madhyena prāṇenātmana ārttimāriṣyasyuddhmāya mariṣyasīti tathā haiva syāt

If any one were to curse him at the eighth (verse), he should say to him, 'Thereby thou hast put thine own central breath into the fire: by that central breath of thine shalt thou undergo suffering, thou shalt expire and die!' for this is what would take place.