Or HaChaim on Leviticus 25:19/אור החיים על ויקרא כ״ה:י״ט

1 ונתנה הארץ פריה, "And the earth shall yield her fruit, etc." The meaning of "her fruit" is that which corresponds to the potential it has been endowed with. When we observe the earth producing fruit this does not prove that the amount of fruit we observe the earth produce is equivalent to the amount the earth is capable of producing. We find in Ketuvot 112 that a certain sage was angry at the earth and decreed that it be prevented from yielding its fruit. As a result of this curse the earth produced far less than previously. If someone had not seen the amount of fruit that piece of earth produced before the sage cursed it, he would have thought that the amount it produced subsequently was the maximum it was capable of producing.

2ואכלתם לשבע, "and you will eat to your satisfaction, etc." Perhaps the Torah had to emphasise this as we could have thought that if the earth were to produce fruit according to its full potential the excess fat of the produce would be so filling that one could not eat one's fill, i.e. לשבע. The Torah therefore reassures us that we will be able to enjoy such fruit to the full.

3וישבתם לבטח עליה. "and you will dwell on it in safety." Although the Torah had already written in verse 18 that we would dwell in the land in safety as a result of performing G'd's comandments, the Torah repeats this promise to assure us that the excellence of the land's produce will not attract raiders bent on stealing our harvests. This verse contains G'd's promise that neighbouring countries would not attack us out of greed for our excellent land.