Exodus 23:15-16

15You shall observe 1the Feast of Unleavened Bread; for seven days you are to eat unleavened bread, as I commanded you, at the appointed time in the 2month Abib, for in it you came out of Egypt. And 34none shall appear before Me empty-handed.

16Also you shall observe 5the Feast of the Harvest of the first fruits of your labors from what you sow in the field; also the Feast of the Ingathering at the end of the year 6when you gather in the fruit of your labors from the field.