Exodus:34:22-24
ylt@Exodus:34:22 @'And a feast of weeks thou dost observe for thyself; first-fruits of wheat-harvest; and the feast of in-gathering, at the revolution of the year.
ylt@Exodus:34:23 @'Three times in a year do all thy males appear before the Lord Jehovah, God of Israel;
ylt@Exodus:34:24 @for I dispossess nations from before thee, and have enlarged thy border, and no man doth desire thy land in thy going up to appear before Jehovah thy God three times in a year.