Adam Clarke on Numbers 23:23

There is no enchantment, etc. - Because God has determined to save them, therefore no enchantment can prevail against them.

According to this time, etc. - I think this clause should be read thus: "As at this time it shall be told to Jacob and to Israel what God worketh;" i. e., this people shall always have prophetic information of what God is about to work. And indeed, they are the only people under heaven who ever had this privilege. When God himself designed to punish them because of their sins, he always forewarned them by the prophets; and also took care to apprise them of all the plots of their enemies against them.