Leviticus 25:2 KJV
Speak unto the children of Israel, and say unto them, When ye come into the land which I give you, then shall the land keep a sabbath unto the LORD.
There are any number of lessons that Israel may have learned by giving their land rest every seventh year:
· To look forward and save
· To be frugal and not waste
· To trust God to supply
There is also a spiritual lesson that goes to Christ, which is that, though they were charged to work, their salvation was never secured by their work but by the grace of God. Christians are saved to good works but not saved by good works.