Exodus 23:15-17

American Standard Version

¹⁵ The feast of unleavened bread shalt thou keep: seven days thou shalt eat unleavened bread, as I commanded thee, at the time appointed in the month Abib (for in it thou camest out from Egypt); and none shall appear before me empty: ¹⁶ and the feast of harvest, the first-fruits of thy labors, which thou sowest in the field: and the feast of ingathering, at the end of the year, when thou gatherest in thy labors out of the field. ¹⁷ Three times in the year all thy males shall appear before the Lord Jehovah.