Exodus 34
22 Ref And you are to keep the feast of weeks when you get in the first-fruits of the grain, and the feast at the turn of the year when you take in the produce of your fields.
23 Ref Three times in the year let all your males come before the Lord, the God of Israel.
24 Ref For I will send out the nations before you and make wide the limits of your land; and no man will make an attempt to take your land while you go up to give worship to the Lord, three times in the year.