Ibn Ezra on Deuteronomy 27:17/אבן עזרא על דברים כ״ז:י״ז

1CURSED BE HE THAT REMOVETH HIS NEIGHBOR’S LANDMARK. For it is done in secret. [MAKETH THE BLIND TO GO ASTRAY.] Likewise it is not possible for the blind person to identify the one who led him astray.