Rabbi Ishmael and Rabbi Akiba differed over the meaning of the word "his" in the clause "of the best of "his" own field, and of the best of "his" own vineyard, shall he make restitution" in Rabbi Ishmael read to require the damager to compensate the injured party out of property equivalent to the "injured party's" best property, whereas Rabbi Akiba read to require the damager to compensate the injured party out of the "damager's" best property. The Mishnah required that a damager compensates for damage done out of the damager's best quality property. The Gemara explained that the Mishnah imposed this high penalty because requires it, and imposes this penalty to discourage the doing of damage.