Exodus 34:22 KJV
And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year’s end.
Exodus 34:22, King James Version
In context
21 Six days thou shalt work, but on the seventh day thou shalt rest: in earing time and in harvest thou shalt rest.
22 And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year’s end.
23 Thrice in the year shall all your men children appear before the Lord God, the God of Israel.