Exodus 34:21-23 Modern English Version (MEV)
21 You shall work six days, but on the seventh day you must rest. Even at the time of plowing and harvest you must rest.
22 You must observe the Feast of Weeks, the first fruits of the wheat harvest, and the Feast of Ingathering at the end of the year. 23 Three times in the year all your males must appear before the Lord God, the God of Israel.