Exodus 34:23 ASV

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.