Leviticus 25:4-5

4but in the seventh year there shall be a Sabbath of solemn rest for the land, a Sabbath to the Lord. You shall not sow your field or prune your vineyard. 5 aYou shall not reap what grows of itself in your harvest, or gather the grapes of your undressed vine. It shall be a year of solemn rest for the land.

Leviticus 25:20-22

20And if you say, b‘What shall we eat in the seventh year, if cwe may not sow or gather in our crop?’ 21I will dcommand my blessing on you in the sixth year, so that it will produce a crop sufficient for three years. 22 eWhen you sow in the eighth year, you will be eating some of fthe old crop; you shall eat the old until the ninth year, when its crop arrives.

Isaiah 7:21-25

21 gIn that day a man will keep alive a young cow and two sheep, 22and because of the abundance of milk that they give, he will eat curds, for everyone who is left in the land will eat hcurds and honey.

23In that day every place where there used to be a thousand vines, worth a thousand shekels
A  shekel was about 2/5 ounce or 11 grams
of silver, will become jbriers and thorns.
24 kWith bow and arrows a man will come there, for all the land will be briers and thorns. 25 lAnd as for all the hills that used to be hoed with a hoe, you will not come there for fear mof briers and thorns, but they will become a place where cattle are let loose and where sheep tread.

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