申命记 1:24

עד 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). וירגלו 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).

וַיִּפְנוּ֙ וַיַּעֲל֣וּ הָהָ֔רָה וַיָּבֹ֖אוּ עַד־נַ֣חַל אֶשְׁכֹּ֑ל וַֽיְרַגְּל֖וּ אֹתָֽהּ׃

and they turned and went up to the mountain, and came to the wadi of Eshkol, and searched it out.