Charles Ellicott Commentary Jeremiah 34:16

"but ye turned and profaned my name, and caused every man his servant, and every man his handmaid, whom ye had let go free at their pleasure, to return; and ye brought them into subjection, to be unto you for servants and for handmaids." — Jeremiah 34:16 (ASV)

But you turned and polluted my name ... —The second verb is the same as that translated “profane the name of the Lord” in Leviticus 19:12, in close connection with the sin of swearing falsely. The sin of which the princes and rich men had been guilty was not merely an act of injustice. They had broken the third commandment as well as the eighth, and were accordingly guilty of sacrilege.