2 Peter 2:16

But was rebuked for his iniquity In a very extraordinary manner; the dumb ass On which he rode; speaking with man's voice That is, in man's language; forbade the madness of the prophet Namely, his endeavour to contradict the will of God, which might well be called madness, because it could have no effect but to bring the curse of God upon himself. “The apostle does not mean that the ass forbade Balaam, in so many words, to go with the princes of Moab; but that her unwillingness to proceed in the journey, her falling down under him rather than go on, her complaint in man's language of his smiting her three times for not going on, and her saying, Was I ever wont to do so to thee, were things, so extraordinary, especially her speaking, that Balaam, from that miracle at least, ought to have understood that the whole was a rebuke from God of his foolish project.” Though Balaam is termed a soothsayer, (Joshua 13:22,) and is said to have used enchantments, (Numbers 24:1,) Peter justly calls him a prophet, on account of God's speaking to him, and giving him a very remarkable prophecy, recorded Numbers 24:15. However, being a very bad man, he may often have feigned communications with the Deity to draw money from the multitude. Perhaps the only communications he ever had with God were on this occasion; and they may have been granted to him, that by uttering them in the hearing of Balak, and of the princes of Moab and Midian, the coming of one out of Jacob, who was to have dominion, might be known to the nations of the East.