Adam Clarke on Job 27:11

I will teach you by the hand of God - Relying on Divine assistance, and not speaking out of my own head, or quoting what others have said I will teach you what the mind of the Almighty is, and I will conceal nothing. Job felt that the good hand of his God was upon him, and that therefore he should make no mistake in his doctrines. In this way the Chaldee understood the words, ביד אל beyad El, by the hand of God, which it translates בנבואת אלהא binbuath Elaha, by the prophecy of God. Those who reject the literal meaning, which conveys a very good sense, may adopt the translation of Mr. Good, which has much to recommend it: "I will teach you concerning the dealings of God."