Exodus 23:13

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

11 But the seventh [year] thou shalt let it rest and lie still; that the poor of thy people may eat: and what they leave the beasts 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 rest, and the son of thy handmaid, and the stranger, may be refreshed.

13 And in all [things] that I have said unto you be circumspect: 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 Thou shalt keep the feast of unleavened bread: (thou shalt eat unleavened bread seven days, as I commanded thee, in the time appointed of 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 firstfruits of thy labours, which thou hast sown in the field: and the feast of ingathering, [which is] in the end of the year, when thou hast gathered in thy labours out of the field.