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 olive-yard.

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

13 And in all [things] that I have said to you be circumspect: and make no mention of the names of other gods, neither let it be heard from thy mouth.

14 Three times thou shalt keep a feast to 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 first-fruits of thy labors, which thou hast sown in the field: and the feast of in-gathering, [which] is in the end of the year, when thou hast gathered in thy labors out of the field.