Exodus 34:21-23

New Revised Standard Version, Anglicised

²¹ For six days you shall work, but on the seventh day you shall rest; even in ploughing time and in harvest time you shall rest. ²² You shall observe the festival of weeks, the first fruits of wheat harvest, and the festival of ingathering at the turn of the year. ²³ Three times in the year all your males shall appear before the Lord God, the God of Israel.