Rashi on Leviticus 25:18/רש"י על ויקרא כ״ה:י״ח

1וישבתם על הארץ לבטח [WHEREFORE YE SHALL DO MY ORDINANCES] AND YE SHALL ABIDE IN THE LAND IN SAFETY — It states this because as a punishment for the sin of neglecting the laws of ”Shemittah” Israel becomes exiled, as it is said (Leviticus 26:33, 34) “(And I will disperse you among the nations…] Then shall the land makeup for the Sabbatical years… even then make up for her Sabbatical years that she has not observed” (Shabbat 33a). The seventy years of the Babylonian exile were indeed a punishment corresponding to the seventy Sabbatical years which they had neglected (cf. Rashi on Leviticus 26:35).