Sforno on Numbers 13:30/ספורנו על במדבר י״ג:ל׳

1ויהס כלב את העם, he silenced the people who had begun to raise their voices, as they did afterwards when the Torah reports in 14,1 “all the people raised their voices and the cried the whole night.”

2אל משה, so that Moses would have a chance to reply. Perhaps Moses replied with the words he referred to in Deuteronomy 1,29: “I told you not to be scared and not to be afraid of the inhabitants of that land, etc.”

3Calev reinforced Moses’ words by saying: עלה נעלה, it is appropriate for us to ascend for they will not be able to stand up against us to prevent us from progressing;

4וירשנו אותו כי יכול נוכל לו, for as soon as we shall ascend in that direction they will flee from us seeing that these inhabitants of Canaan have already a defeatist attitude toward us.