Numbers 13:20

and what the land is, whether it be fat or lean, namely, so far as fertility of the soil was concerned, whether there be wood therein, or not; for the forests of a land are a very important item in its material prosperity. And be ye of good courage, they should attend to the work entrusted to them with all brave diligence, and bring of the fruit of the land, as a sample of its productivity. Now the time was the time of the first ripe grapes, late summer or the beginning of autumn. This charge of Moses was intended to give them the valiant, undaunted hearts which they needed for the discharge of their difficult mission.