Exodus 34:22-24

22— And thou shalt observe the feast of weeks, of the first-fruits of wheat-harvest, and the feast of ingathering at the turn of the year.

23Thrice in the year shall all thy males appear before the Lord Jehovah, the 1God of Israel.

24For I will dispossess the nations before thee, and enlarge thy border, and no man shall desire thy land, when thou goest up to appear before the face of Jehovah thy 2God thrice in the year.