Exodus 23:16,17
And the feast of harvest, the first fruits of your labors, which you have sown in the field: and the feast of ingathering, which is in the end of the year, when you have gathered in your labors out of the field.
Torrey's Topical Textbook—AKJV

Deuteronomy 16:16
Three times in a year shall all your males appear before the LORD your God in the place which he shall choose; in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the LORD empty:
Torrey's Topical Textbook—AKJV