Exodus 34:23 in the World English Bible
Three times in the year all your males shall appear before the Lord GOD, the God of Israel.
Context
22 And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year’s end.
23 Thrice in the year shall all your men children appear before the Lord GOD, the God of Israel.
24 For I will cast out the nations before thee, and enlarge thy borders: neither shall any man desire thy land, when thou shalt go up to appear before the LORD thy God thrice in the year.