Deuteronomy 26:1

Here is, I. A good work ordered to be done, and that is the presenting of a basket of their first-fruits to God every year, Deu 26:1, Deu 26:2. Besides the sheaf of first-fruits, which was offered for the whole land, on the morrow after the passover (Lev 23:10), every man was to bring for himself a basket of first-fruits at the feast of pentecost, when the harvest was ended, which is therefore called the feast of first-fruits (Exo 34:22), and is said to be kept with a tribute of free-will-offering, Deu 16:10. But the Jews say, "The first-fruits, if not brought then, might be brought any time after, between that and winter." When a man went into the field or vineyard at the time when the fruits were ripening, he was to mark that which he observed most forward, and to lay it by for first-fruits, wheat, barley, grapes, figs, pomegranates, olives, and dates, some of each sort must be put in the same basket, with leaves between them, and presented to God in the place which he should choose. Now from this law we may learn, 1. To acknowledge God as the giver of all those good things which are the support and comfort of our natural life, and therefore to serve and honour him with them. 2. To deny ourselves. What is first ripe we are most fond of; those that are nice and curious expect to be served with each fruit at its first coming in.

— Matthew Henry's Concise Commentary (public domain)