The Little Midrash Says: The Book of Sh'Mos

Rashi, as cited by Rabbi Moshe Weissman in The Little Midrash Says: The Book of Sh'Mos, also made a related comment.

"...As soon as Pharaoh heard that the Jews were again coming closer to Egypt, he called his generals and his army.

'The Jews are traveling in circles,' he exclaimed. 'They seem to be lost. Quickly, let us chase after them. I will ride at the head of the army. When we reach them, we will kill all the Jews and take back our money!'

Pharaoh himself prepared his chariot. He would not wait for his servants to get it ready, so eager was he to chase after Bnai Yisroel.'"