Exodus 23:14-17

MLV(i) 14 Three times you will keep a feast to me in the year. 15 You will keep the feast of unleavened bread (Seven days you will eat unleavened bread, as I commanded you, at the time appointed in the month Abib, because in it you came out from Egypt and none will appear before me empty), 16 and the feast of harvest, the first-fruits of your labors, which you sow in the field and the feast of ingathering at the end of the year, when you gather in your labors out of the field. 17 Three times in the year all your males will appear before the lord Jehovah.