Exodus 34:22-24

22Eat the Feast of Weeks every year when you cut the first wheat in your fields. Eat the Feast of Harvest at the end of each year.

23Three times in every year, all your men must come to worship the Lord God, the God of Israel.

24I will chase the nations out of the land as you move in. I will give you more and more land to live in. Three times each year you must come to worship the Lord your God. When you do that, nobody will try to take your land for themselves.