These two themes, though apparently quite distinct, are in fact intimately related.
Farmers are neither to sow nor harvest during the seventh year.
All the inhabitants of the land are free to eat whatever grows of itself in any field, but they are not to work the field in any way, or to use the food for commerce. Moses goes on to instruct the people to count off seven cycles of sabbatical years, or a total of forty-nine years. The Jubilee is a year of rest for the land, like the sabbatical years, but it also is a year of return or restoration. Jubilee restores the original order of Israel as Adonai intended it to be. Further, he points out that the shofar need not necessarily be a ram's horn, but can be made of the horn of the wild goat.