Śatapatha Brāhmaṇa ("of a hundred paths") 1.4.3.19

1.4.3.19

yadi navamyāṃ ... yāciśnaṃ vā etadātmano 'gnāvādhāḥ śiśnenātmana ārttimāriṣyasi klībo bhavi ... syāt

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