Charles Ellicott Commentary Jeremiah 34:15

"And ye were now turned, and had done that which is right in mine eyes, in proclaiming liberty every man to his neighbor; and ye had made a covenant before me in the house which is called by my name:" — Jeremiah 34:15 (ASV)

You had made a covenant before me in the house which is called by my name. —These words point to the solemnity with which the new engagements had been contracted.

It was not merely that the king had issued an edict, or that judges had given their decisions in accordance with the old law. Instead, princes and people had met together in the courts of the Temple. There, in the presence of Jehovah, they had entered into this covenant with Him and with each other, just as their descendants afterwards did in the days of Nehemiah (Nehemiah 5:12–13).

Their sin in breaking their covenant was therefore a sin against Him as well as against their brethren.