The full meaning of this statement can be made explicit. AT: "will hear about the punishment and be afraid of getting punished" (See: [[rc://en/ta/man/translate/figs-explicit]])
Here "eyes" refer to the whole person. AT: "You must not pity him" or "You must not show him mercy" (See: [[rc://en/ta/man/translate/figs-synecdoche]])
Here the phrases are shortened because the meaning is understood. It means the people must punish a person in the same way that he harmed another person. (See: [[rc://en/ta/man/translate/figs-ellipsis]])