Sforno on Numbers 13:20/ספורנו על במדבר י״ג:כ׳

1השמנה היא, does it possess riches, surpluses, as Moses said in Deuteronomy 8,9 לא במסכנות תאכל בה לחם, “where you will eat bread without having to stint.”

2היש בה עץ, are there fruit trees, such as grape vines, fig trees, pomegranate trees and olive trees.

3והתחזקתם ולקחתם מפרי הארץ, do not be afraid that the local inhabitants will notice your taking some produce and will attack you on account of that.

4והימים ימי בכורי ענבים, the fruit for which the land is famous had not even fully ripened as yet as it was still early in the season. Even so, what they would see would be enough to convince them of the excellence of the land.