Balak: Chapter 42

"And the she-mule saw the angel of Hashem"

Synopsis

When Rabbi Yitzchak wonders why the she-mule was able to see the angel and yet the supposedly wise Bilaam was not, Rabbi Yosi says the wicked should not gaze at a holy sight. They talk about Bilaam falling down before he saw his visions, and having his eyes open at the time, but as they do not know the correct interpretation of this they go to see Rabbi Shimon.