Rabanus Maurus
Catena Aurea · Matthäusevangelium 18
Woe unto the world because of offences! for it must needs be that offences come; but woe to that man by whom the offence cometh. Wherefore if thy hand or thy foot offend thee, cut them off, and cast them from thee: it is better for thee to enter into life halt or maimed, rather than having two hands or two feet to be cast into everlasting fire. And if thine eye offend thee, pluck it out, and cast it from thee: it is better for thee to enter into life with one eye, rather than having two eyes to be east into hell fire.
Scandal (offence) is a Greek word, which we may call a stumbling-block, or a fall, or hitting of the foot. He then scandalizes his brother, who by word or deed amiss gives him occasion of falling.