Or HaChaim on Numbers 13:30/אור החיים על במדבר י״ג:ל׳

1 ויהס כלב את העם, Caleb silenced the people, etc. Seeing that an ordinary individual is not capable of silencing a people numbering hundreds of thousands, the Torah adds the words אל משה, to tell us that he silenced them in order to make them listen to Moses, not to himself. We know from Deut. 33,5 that Moses' rank was equivalent to the rank of a king. Caleb invoked the awe and respect due to a king in order to silence the people. Having invoked Moses' authority, he said: "we most certainly are able to to go up and take possession of the land." He meant that in spite of the other spies' having said: "we cannot overcome this people," he felt that the Israelites would be able to prevail.