Exodus 23:14-17

14“Three times a year you are to celebrate a festival to me. 15“Celebrate the Festival of Unleavened Bread; for seven days eat bread made without yeast, as I commanded you. Do this at the appointed time in the month of Aviv, for in that month you came out of Egypt. “No one is to appear before me empty-handed. 16“Celebrate the Festival of Harvest with the firstfruits of the crops you sow in your field. “Celebrate the Festival of Ingathering at the end of the year, when you gather in your crops from the field. 17“Three times a year all the men are to appear before the Sovereign Lord.