Or HaChaim on Numbers 14:7/אור החיים על במדבר י״ד:ז׳

1 ויאמרו…לאמור. They said…to say: What is the meaning of the word לאמור after the Torah has already told us to whom Joshua and Caleb addressed themselves? Perhaps Caleb and Joshua used this expression referring to the ten spies who had admitted that the land was indeed excellent, flowing with milk and honey. Whereas the ten spies described this excellent land as unattainable in order to justify their report, Joshua and Caleb used the excellence of the land as a reason to extol it. The word לאמור then means "to extol" much as in Deut. 26,27.

2טובה הארץ מאד מאד, "the land is indeed very good." They wanted to contradict the claim that the land consumes its inhabitants. This is why they said twice מאד, to say its fruit was good and it was pleasant to live in that land. Concerning the number of impediments which the other spies had enumerated they said that with G'd's help none of these factors mattered. They interpreted what they had seen to mean that G'd had already given the land to them on a platter.