 Rav interpreted the words, "and blessed shall you be in the field," to mean that your property would be near the city.Rav interpreted the words of "Blessed shall you be when you come in," to mean that you would not find your wife in doubt of being a "niddah" upon returning home from travels.And Rav interpreted the words, "and blessed shall you be when you go out," to mean that your children would be like you.