Leviticus 25:2-4

25:2 “Speak to the Israelites and tell them, ‘When you enter the land that I am giving you, the land must observe a Sabbath to the Lord. 25:3 Six years you may sow your field, and six years you may prune your vineyard and gather the produce, 25:4 but in the seventh year the land must have a Sabbath of complete rest – a Sabbath to the Lord. You must not sow your field or prune your vineyard.

Leviticus 25:10

25:10 So you must consecrate the fiftieth year, and you must proclaim a release in the land for all its inhabitants. That year will be your jubilee; each one of you must return to his property and each one of you must return to his clan.