Exodus 34:23

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

Exodus 34:23 In-Context

21 Six days thou shalt work, but on the seventh day thou shalt rest: in plowing time and in harvest thou shalt rest.
22 And thou shalt observe the feast of weeks, [even] of the first-fruits of wheat harvest, and the feast of ingathering at the year's end.
23 Three times in the year shall all thy males appear before the Lord Jehovah, the God of Israel.
24 For I will cast out nations before thee, and enlarge thy borders: neither shall any man desire thy land, when thou goest up to appear before Jehovah thy God three times in the year.
25 Thou shalt not offer the blood of my sacrifice with leavened bread; neither shall the sacrifice of the feast of the passover be left unto the morning.
The American Standard Version is in the public domain.