Exodus 23:10
"For six years you shall sow your land, and shall gather in its increase,
Leviticus 25:3-4
Six years you shall sow your field, and six years you shall prune your vineyard, and gather in its fruits;
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Summary
                            And six years thou shalt sow thy land, and shalt gather in the fruits thereof:                        
                    General references
Bible References
General references
                                        Leviticus 25:4                                        
                                                                                                                                but in the seventh year there shall be a Sabbath of solemn rest for the land, a Sabbath to Yahweh. You shall not sow your field or prune your vineyard.
                                    
                                        Deuteronomy 15:1                                        
                                                            
                        At the end of every seven years you shall make a release.