Exodus 23:19 "You shall bring the first of the fruits of your land that ripen"

A farmer observes with pride and satisfaction the first-fruits that ripen on his trees.

As he sees the first juicy grapes growing, he is very anxious to taste them, but he knows that he must set them aside and bring them to the Beit HaMikdash. There, he presents them to the priest.

This Positive Mitzvah applies only to those seven kinds of foods that Eretz Yisrael was specifically blessed with.

They are: Wheat; Barley; Grapes; Figs; Pomegranates; Olives; Dates.