You shall keep the Feast of Harvest, of the firstfruits of your labor, of what you sow in the field. You shall keep the Feast of Ingathering at the end of the year, when you gather in from the field the fruit of your labor.
Here is, I. The institution of the sabbatical year, Exo 23:10, Exo 23:11. Every seventh year the land was to rest; they must not plough nor sow it at the beginning of the year, and then they could not expect any great harvest at the end of the year: but what the earth did produce of itself should be eaten from hand to mouth, and not laid up.
Commenting on Exodus 23:10-19
Thou shall not offer the blood of my sacrifice with leavened bread,.... This belongs to the feast of the passover; for, as all the Jewish writers agree, this sacrifice is the sacrifice of the passover, as it is sometimes called, see Exo 12:27 now when the paschal lamb was killed, and its blood shed, and its flesh eaten, there was to be no leaven along...
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. (h) Which is Whit Sunday, in token that the law was given 50 days after they departed from Egypt.