Albert Barnes Commentary Numbers 13:23

"And they came unto the valley of Eshcol, and cut down from thence a branch with one cluster of grapes, and they bare it upon a staff between two; [they brought] also of the pomegranates, and of the figs." — Numbers 13:23 (ASV)

The brook of Eshcol is by some identified with the rich valley immediately to the north of Hebron (but by others with Wady Hanein to the south of Hebron). The valley was, in all likelihood, originally named after one of the three chiefs who were allied with Abraham (Genesis 14:24); but, as often happened, the Israelites, wittingly or unwittingly, adopted in a new and significant sense the name which they found; and to them the valley thus became the Valley of the Cluster. Bunches of grapes are found in Palestine weighing many pounds.