Shatapatha Brahmana 11.8.3.10

11.8.3.10

cakṣureva paśūnāmādatta tasmādete cākaśyamānā ivaiva na jānantyatha yadaivopajighrantyatha jānantyāttaṃ hyeṣāṃ cakṣurā ha vai dviṣato bhrātṛvyasya cakṣurtatte ya evaṃ veda

He took to himself the eye of cattle; whence, even whilst seeing clearly, as it were, they do not know anything, but only know what it is when they smell at it, for their eye has been taken from them; and, verily, he who knows this takes away the eye of his spiteful enemy.