From the top of the rocks, upon which I now stand, I see the people, according to thy desire, Numbers 22:41, but cannot improve that sight to the end for which thou didst design it, to wit, to curse them. This people are of a distinct kind from others, God's peculiar people, separated from all other nations, as in religion and laws, also in Divine protection; and therefore my enchantments cannot have that power against them which they have against other persons and people. See Exodus 19:5 Leviticus 20:21,26.
Related Commentaries of Numbers 23:9
Numbers 23:9
9 For from the top of the rocks I see him, and from the hills I behold him: lo, the people shall dwell alone, and shall not be reckoned among the nations.