| Barnes' Notes on the Bible After forty days - They had no doubt in this time explored the whole land. However, it was with the southern part that the Israelites expected to have to deal immediately: and accordingly it is that which is particularly referred to in the following verses, Hebron and its vicinity above all.
Gill's Exposition of the Entire BibleAnd they returned from searching the land after forty days. The Targum of Jonathan adds, on the eighth day of the month Ab, which answers to part of July and part of August; so that this must be towards the latter end of July: some Jewish writers (k) say it was the ninth of Ab; hence the tradition, that it was decreed on the ninth of Ab concerning their fathers, that they should not enter into the land (l). (k) Seder Olam Rabba, c. 8. p. 24. (l) Misn. Taanith, c. 4. sect. 7.
Keil and Delitzsch Biblical Commentary on the Old TestamentIn forty days the spies returned to the camp at Kadesh (see at Numbers 16:6), and reported the great fertility of the land ("it floweth with milk and honey," see at Exodus 3:8), pointing, at the same time, to the fruit they had brought with them; "nevertheless," they added (כּי אפס, "only that"), "the people be strong that dwell in the land, and the cities are fortified, very large: and, moreover, we saw the children of Anak there." Amalekites dwelt in the south (see at Genesis 36:12); Hittites, Jebusites, and Amorites in the mountains (see at Genesis 10:15-16); and Canaanites by the (Mediterranean) Sea and on the side of the Jordan, i.e., in the Arabah or Ghor (see at Genesis 13:7 and Genesis 10:15-18).
Geneva Study BibleAnd they returned from searching of the land after forty days.
Wesley's Notes 13:25 They returned after forty days - 'Tis a wonder the people had patience to stay forty days, when they were just ready to enter Canaan, under all the assurances of success they could have from the Divine power, proved by a constant series of miracles, that had hitherto attended them. But they distrusted God, and chose to be held in suspence by their own counsels, rather than to rest upon God's promise! How much do we stand in our own light by unbelief?
Matthew Henry's Concise Commentary13:21-25 The searchers of the land brought a bunch of grapes with them, and other fruits, as proofs of the goodness of the country; which was to Israel both the earnest and the specimen of all the fruits of Canaan. Such are the present comforts we have in communion with God, foretastes of the fulness of joy we expect in the heavenly Canaan. We may see by them what heaven is.
Matthew Henry's Whole Bible CommentaryVerses 21-25 We have here a short account of the survey which the spies made of the promised land. 1. They went quite through it, from Zin in the south, to Rehob, near Hamath, in the north, v. 21. See ch. 34:3, 8. It is probable that they did not go altogether in a body, lest they should be suspected and taken up, which there would be the more danger of if the Canaanites knew (and one would think they could not but know) how near the Israelites were to them; but they divided themselves into several companies, and so passed unsuspected, as way-faring men. 2. They took particular notice of Hebron (v. 22), probably because near there was the field of Machpelah, where the patriarchs were buried (Gen. 23:2), whose dead bodies did, as it were, keep possession of that land for their posterity. To this sepulchre they made a particular visit, and found the adjoining city in the possession of the sons of Anak, who are here named. In that place where they expected the greatest encouragements they met with the greatest discouragements. Where the bodies of their ancestors kept possession for them the giants kept possession against them. They ascended by the south, and came to Hebron, that is, "Caleb," say the Jews, "in particular," for to his being there we find express reference, Jos. 14:9, 12, 13. But that others of the spies were there too appears by their description of the Anakim, v. 33. 3. They brought a bunch of grapes with them, and some other of the fruits of the land, as a proof of the extraordinary goodness of the country. Probably they furnished themselves with these fruits when they were leaving the country and returning. The cluster of grapes was so large and so heavy that they hung it upon a bar, and carried it between two of them, v. 23, 24. The place whence they took it was, from this circumstance, called the valley of the cluster, that famous cluster which was to Israel both the earnest and the specimen of all the fruits of Canaan. Such are the present comforts which we have in communion with God, foretastes of the fulness of joy we expect in the heavenly Canaan. We may see by them what heaven is. | 
