Levítico 25:21

I will: As it is here graciously promised, that the sixth year was to bring forth fruits for three years, not merely for two, it is evident that both the sabbatical year and the year of jubilee were distinctly provided for. They were not to sow from the sixth to the eighth year, omitting two seed times; nor reap from the sixth to the ninth, omitting two harvests. No legislator, unless conscious of being divinely commissioned, would have committed himself by enacting such a law as this; nor would any people have submitted to receive it, except in consequence of the fullest conviction that a divine authority had dictated it. It therefore stands as a proof that Moses acted by the express direction of the Almighty, and that the people were fully persuaded of the reality of his divine mission by the miracles he wrought. Genesis 26:12, Genesis 41:47, Exodus 16:29, Deuteronomy 28:3, Deuteronomy 28:8, Psalms 133:3, Proverbs 10:22, 2 Corinthians 9:10

three years: Leviticus 25:4, Leviticus 25:8-1 Kings :

Reciprocal: Exodus 16:5 - prepare Leviticus 26:4 - the land 2 Chronicles 31:10 - the Lord Psalms 42:8 - command Matthew 6:33 - and all Luke 13:7 - three Hebrews 6:7 - receiveth