Because of the disobedience of God’s people, whose sins may have included a failure to observe all the Sabbath years, the punishment was that their land would remain unworked and deserted for 70 years. ​ — Leviticus 26: 27, 32 - 35, 42, 43.
( 3. Mozus 26: 27, 32 — 35, 42, 43.)