Exodus 23:13

10 And six years thou shalt sow thy land, and shalt gather in the increase thereof:

11 but the seventh year thou shalt let it rest and lie fallow; that the poor of thy people may eat: and what they leave the beast of the field shall eat. In like manner thou shalt deal with thy vineyard, [and] with thy oliveyard.

12 Six days thou shalt do thy work, and on the seventh day thou shalt rest; that thine ox and thine ass may have rest, and the son of thy handmaid, and the sojourner, may be refreshed.

13 And in all things that I have said unto you take ye heed: and make no mention of the name of other gods, neither let it be heard out of thy mouth.

14 Three times thou shalt keep a feast unto me in the year.

15 The feast of unleavened bread shalt thou keep: seven days thou shalt eat unleavened bread, as I commanded thee, at the time appointed in the month Abib (for in it thou camest out from Egypt); and none shall appear before me empty:

16 and the feast of harvest, the first-fruits of thy labors, which thou sowest in the field: and the feast of ingathering, at the end of the year, when thou gatherest in thy labors out of the field.