But was rebuked for his iniquity. — Literally, But had a conviction of his own transgression — i.e., was convicted of it, or rebuked for it. His transgression was that, although as a prophet he knew the blessedness of Israel, and although God gave him leave to go only on condition of his blessing Israel, he went still cherishing a hope of being able to curse, and so winning Balak’s promised reward.
The dumb ass. — Literally, a dumb beast of burden. The same word is rendered “ass” in Matthew 21:5, in the phrase “foal of an ass.” In Palestine the ass was the most common beast of burden, horses being rare, so that in most cases “beast of burden” would necessarily mean “ass.”
Forbad the madness. — Strictly, hindered the madness; and thus the trivial discrepancy which some would urge as existing between this passage and Numbers 22 disappears. It has been objected that not the ass but the angel forbad Balaam from proceeding. But it was the ass which hindered the infatuation of Balaam from hurrying him to his own destruction (Numbers 22:33). The word for “madness” is probably chosen for the sake of alliteration with “prophet” — prophétou paraphronian. It is a very rare formation, perhaps coined by the writer himself.