Sforno on Numbers 24:12/ספורנו על במדבר כ״ד:י״ב

1הלא גם אל מלאכיך, you have no cause to be surprised as I told your emissaries already that the reason I had not complied with your request was not that I did not think that you paid me sufficient honour. I had told them that the matter was not within my power.