Exodus 34:22

34:22 And thou shalt observe the feast of weeks, of the firstfruits of wheat harvest, and the feast of ingathering at the year’s end.

Numbers 15:20

15:20 Ye shall offer up a cake of the first of your dough [for] an heave offering: as [ye do] the heave offering of the threshingfloor, so shall ye heave it.

Deuteronomy 16:13

16:13 Thou shalt observe the feast of tabernacles seven days, after that thou hast gathered in thy corn and thy wine: