וַיָּק֙וּמוּ֙ שָׂרֵ֣י מוֹאָ֔ב וַיָּבֹ֖אוּ אֶל־בָּלָ֑ק וַיֹּ֣אמְר֔וּ מֵאֵ֥ן בִּלְעָ֖ם הֲלֹ֥ךְ עִמָּֽנוּ׃
Die Fürsten Moabs standen auf und gingen zu Balak und sprachen: Bileam hat sich geweigert mit uns zu gehen.
Or HaChaim on Numbers
מאן בלעם הלך עמנו, "Bileam refused to come with us." They suspected him of being a liar, accusing him of desiring more honour than what Balak had shown him thus far. It is also possible that seeing that Bileam had promised to inform the emissaries immediately of G'd's answer but had not done so until morning, this made them assume that he told them what he wanted them to know and not what G'd had told him. Perhaps there was even a traditon that Bileam was a compulsive liar.
Rashbam on Numbers
הלוך עמנו, for we do not appear as men of substance in his eyes.