Sforno on Numbers 21:27/ספורנו על במדבר כ״א:כ״ז

1על כן יאמרו המושלים, the people who reveal the visions they have seen in their dreams and their interpretations of these visions, as did Bileam when his interpretation is introduced with the words וישא משלו (Numbers 23,7).

2בואו חשבון, “you the inhabitants of Moav come to Cheshbon and subject yourselves to the rule of Sichon for he will defeat you and rule over you.”