The circumstances of the fact itself is unquestionable, since the apostle tells us that the dumb ass spake with man's voice. 2 Peter 2:16. And why should the thing be thought incredible? Who hath made man's mouth? is a question of the LORD himself, to show that all things are of him. Exodus 4:11.
Related Commentaries of Numbers 22:28
Numbers 22:28-30
28 And the LORD opened the mouth of the ass, and she said unto Balaam, What have I done unto thee, that thou hast smitten me these three times?
29 And Balaam said unto the ass, Because thou hast mocked me: I would there were a sword in mine hand, for now would I kill thee.
30 And the ass said unto Balaam, Am not I thine ass, upon which thou hast ridden ever since I was thine unto this day? was I ever wont to do so unto thee? And he said, Nay.