Numbers 22:33

And the ass saw me, and turned from me these three times
The ass saw the angel when Balaam did not, and that was the reason of its turning aside; and it was well for him it did, and therefore he should not have smote it:

unless she had turned from me;
if she had pushed on, endeavouring to make her way:

surely now also I had slain thee, and saved her alive;
had certainly and only slain him, and not the ass; and from hence the Jewish writers

F20 Bemidbar Rabba, sect. 20. fol. 227. 4. Aben Ezra in loc.