Shatapatha Brahmana 1.6.1.16

1.6.1.16

sa yadyenam purastāt | yajñasyānuvyāharettam prati brūyānmukhyāmārttimāriṣyasyandho vā badhiro vā bhaviṣyasītyetā vai mukhyā ārttayastathā haiva syāt

And if any one were to imprecate evil on him previously to (or, in the fore-part of) the (chief) sacrifice, let him be thus spoken to, 'Thou shalt suffer some disease of the face! thou shalt become either blind or deaf!' for these, in truth, are diseases of the face: and thus it would indeed fare with him.