Exodus 23:16; Exodus 34:21-22

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.
21 Six days thou shalt work, but on the seventh day thou shalt rest: in earing time and in harvest thou shalt rest. 22 And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year's end.
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