Rashi on Numbers 23:17/רש"י על במדבר כ״ג:י״ז

1ושרי מואב עמו AND THE PRINCES OF MOAB WITH HIM — But above (v. 6) it states, “And all the princes of Moab”?! As soon as they saw that there was no hope for them in him, part of them went away, and only part of them remained (Midrash Tanchuma, Balak 13).

2מה דבר ה׳ WHAT HATH THE LORD SPOKEN? — This was a derisive expression, as much as to say, “You are not your own master” (Midrash Tanchuma, Balak 13).