Exodus 34:21-25

“You shall work six days, but on the seventh day you shall rest; even during plowing time and harvest you shall rest.

And you shall celebrate the Feast of Weeks, that is, the first fruits of the wheat harvest, and the Feast of Ingathering at the turn of the year.

Three times a year all your males are to appear before the Lord God, the God of Israel.

For I will drive out nations from you and enlarge your borders, and no one will covet your land when you go up three times a year to appear before the Lord your God.

“You shall not offer the blood of My sacrifice with leavened bread, nor is the sacrifice of the Feast of the Passover to be left over until morning.