For the oppression — i.e., on account of the oppression. Here, as in so many psalms and prophecies, we have an ancient oracle of God introduced. The poet first quotes it, and then in Psalms 12:6 contrasts its truth and genuineness with the false speeches of hypocrites.
I will set. — Literally, I will set in safety; he blows at it: which may mean either, “I will ensure him of the safety for which he panteth,” or “I will set him in safety who panteth for it.” This sense is fixed by Habakkuk 2:3 : “it panteth to its end,” i.e., for its accomplishment.