Exodus 23:14-17

ISV(i) 14 "Three times a year you shall celebrate a festival for me. 15 You shall observe the Festival of Unleavened Bread. As I commanded you, you shall eat unleavened bread for seven days at the appointed time in the month Abib, for in it you came out of Egypt. No one shall appear before me empty handed. 16 You shall observe the Festival of Harvest, celebrating the first fruits of your work in planting the field, and the Festival of Ingathering at the end of the year, when you gather the fruit of your work from the field. 17 Three times a year all your males shall appear before the Lord GOD."