Rashi on Deuteronomy 1:24/רש"י על דברים א׳:כ״ד

1עד נחל אשכל [AND THEY CAME] TO THE BROOK OF ESHCOL — This tells us that it was so called on account of what was eventually, to happen there [— that they took from there a cluster (אשכל) of grapes] (Sifrei Devarim 22:2).

2וירגלו אתה AND THEY SPIED IT OUT — This teaches that they passed through it along four lines, along the length and the breadth (Sifrei Devarim 22:3; cf. Rashi on Numbers 13:21).