Rashi on Numbers 24:13/רש"י על במדבר כ״ד:י״ג

1לעבר את פי ה׳ [I AM UNABLE] TO GO BEYOND THE WORD OF THE LORD — Here it does not say “[the Lord] my God”, as it is said at first (Numbers 22:18), because he had now become conscious that he was regarded by the Holy One, blessed be He, as something vile and banished from His presence.