Or HaChaim on Leviticus 25:37/אור החיים על ויקרא כ״ה:ל״ז

1 את כספך לא תתן לו בנשך, "You shall not give him your money upon interest;" Here the Torah explains what the words נשך ומרבית are all about; they darken the divine light G'd provides. The word את כספך refers to the material things man yearns for in this world believing them to be of real value though their value is totally illusory. לא תתן לו בנשך When man fulfils his animalistic instincts and thereby tries to gratify his spiritual needs his spirit is actually "bitten," נשוך and the poison of sin is absorbed by that person's רוח. The Torah continues: ובמרבית לא תתן אכלך, "and you must not give him your food in return for increase." The Torah means that even your food, i.e. something that it is certainly permissible for you to eat you must not consume to excess, i.e. מרבית. When a person follows the needs of his palate he gradually increases his appetite for more food than is needed to sustain him. This is turn also leads to the divine light G'd has granted us by means of our pure soul being gradually more and more "blacked out." The stronger the physical in man the weaker his spiritual capacity. Encouraging the body to grow stronger through gratifying its appetites therefore is sinful. This is why Proverbs 13,25 teaches us that "the righteous eats onIy to satisfy the needs of his life-force, נפש." Solomon says this to remind us that it is not our palate which should dictate the quantity or quality of our food-intake. When the Torah continues אני השם (verse 38), this means that although G'd has taken us out of Egypt in order to give us the land of Canaan, the purpose was not in order for the Jewish people to stuff themselves on the good fruit of the land but in order for Him to be our G'd, something that requires the land of Israel. Our sages in Torat Kohanim say that anyone who merely lives in the land of Israel is as if he had accepted for himself G'd's sovereignty.